Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c21f2c2de22243…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 20:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1df73b3c5cb6c531e2249a6ee7a144c SHA-1: 3621bac81c6ed243feefd7d6dd36354b726f138d SHA-256: c8c21f2c2de22243e6aa6def4b4a6d7799913ab73c0386559f47c7545f9e5de4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The primary attack pattern involves luring users through a phishing attachment to a site that then redirects them to further malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://videofilm-tv.ru/content/File/bibomu.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b418215cd---difopasogopovomowososudol.pdfIn PDF document text
    • http://ibb-online.ru/f/file/ladoguwuk.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/90225989800.pdfIn PDF document text
    • http://jp-cable.com/d/files/gakebeliso.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabf3ce8b1---gubusepekax.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/77ded5j60g8sjdn39g309lbdji/20136622482.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832fe6cd26c---70094616504.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd532f138ad---72129546684.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/46332993852.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/74732311216.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089014564dfb---bojuzunowuwi.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/26870361606.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f6e863d7---4084555637.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf60bd2a2---10816577607.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/9c2da64a18e7384ee30577f4116feb38/totidavilomaxupubesavebi.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/14817794683.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/roruduwutobupikesu.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/60375739316.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0303a78a444624fea72dae28b4c8c848/37838174799.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/zusakudazurem.pdfIn PDF document text
    • https://chp-travel.ir/data/file/wisijexufusidigujepus.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/67522403616.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080362a2674f---lizatofutiguzodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=a+clash+of+kings+chaptersPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 10832 bytes
SHA-256: b72d36182c31112569a680e6b5b7f8516bc5c2f2b67629eb9452d0b1eec0d49a
font_01_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325B 16812 bytes
SHA-256: 1ce86728ae7584398b9c616abdb96f928646b417d01b7b9f4b0b9abbc11ef47c

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