Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bfc79ac4384155…

MALICIOUS

PDF

82.0 KB Created: 2021-07-02 05:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dfc168960986bd635c455d2102fff332 SHA-1: 952f92503938ff90b0a99d2b0bac2cf3986a4173 SHA-256: f7bfc79ac4384155784e1e1e5b02528542076adc96c72baaca4c0d94ca2fab60
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, some pointing to compromised WordPress sites, and a link farm structure. The document also contains instructions to disable security software and execute commands via copy-pasting into a shell, indicating a likely attempt to download and execute a secondary payload. The presence of these elements strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=activate+key+office+2019 PDF link annotation
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/aebea6fff77ae11cb75845deea3ef599/12711692801.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7de51f6f5---66439735630.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/l3c8m20abd12e6a6ca2mp187h5/38512502820.pdfIn PDF document text
    • https://arerp.kr/data/file///77831456923.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///64246583955.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/wirul.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/806c2180a3a9ec4a2b86f1924504078e/kejofapu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fac768128---28505629410.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/36641178553.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p9rp9o7t3sqoklgb0qet9rouj1/talafopixijulabavirafi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6eb306db---27957232010.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6391773cf55408a0f1eb9393c0bda477/47571180344.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c12ea440a---25502469884.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/47431550885.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c0f7206222b6248d436a2d06dbaea2fa/kelagafawojanifukerugeped.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/887cee1f4e7687fcb2bcc0df87d54171/bedawunezenakuroxefivilem.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/60985320957.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f18ea35d---badonotej.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/komoxoxabupavofoxo.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/88220248311.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77cf94a19b---74812654326.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/71664a37ff8dd4308ecc079734ae4ea1/20973413397.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b821fae2e5c---70520022656.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/bozasosamapasozu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9395daa1a69693bf669b2e500b508eec/61911372931.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 17088 bytes
SHA-256: bd5a5114a13cb81f1c9a4b41d7576f07cf25b078efd96f242ec17a9a2e55723c
font_02_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 10624 bytes
SHA-256: 0a8e69d1672a4ec69b51d6ccbd154ec77a79d9afeee941714ed0247329d40d55

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