Malicious PDF — malware analysis report

Static analysis result for SHA-256 a100cdaa676c138c…

MALICIOUS

PDF

81.0 KB Created: 2021-06-28 00:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1ac7489b1a18c8acc4ec3f0b498619b SHA-1: 252ff922f00ca281a1ca23d57e9f92008797b1b7 SHA-256: a100cdaa676c138c8bed424afba04e5f684911f533195bba1a72116ba4e0ff80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://wastran.ru/uplcv?utm_term=questions+to+ask+her+to+fall+in+love+with+you PDF link annotation
    • http://shreejians.com/userfiles/file/14500793509.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079c23b49a6e---81071939229.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072592670f84---36566681656.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4ecd2601a1a8c44fbd97d439fc30d85c/45007697226.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/atdr4m46vp24itq3nml5efer72/89754347229.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tibefesigokivek.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/d0mo0tv55p457r72d4vfh9koi8/ginabenamis.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b4468c3ad---nelineroset.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/98aebc54bff1094ee5fb566ad5af2851/jubofivuzudo.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/27486035260.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5956e9bea4c147c391161cb475dffcb5/sigifuzediwe.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/kodekumoguwo.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/51479332315.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/enn411j291j7ra8ihunqvvql19/53056942092.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa61d0ec97---39701973977.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/zodof.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/48045536742.pdfIn PDF document text
    • http://topas.lt/userfiles/file/81687355098.pdfIn PDF document text
    • http://yuha.be/_files/file/45871362021.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7a7ab370c1f1366c875db2ccf45c0167/zekavanupuv.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/4508671839.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/mabosirixa.pdfIn PDF document text
    • https://asiabiru.com/contents//files/35845388866.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/68440892569.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC299 10828 bytes
SHA-256: 07b67841743ac1b5f0e2ade5fc4717d9410552bf9db1fbfabdd43238c53fdf43
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 15912 bytes
SHA-256: 8f0b5461ddb94077caf7c0c0cfe830cb765ec071adb70f24f833604cd83cd3f7
font_02_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 17132 bytes
SHA-256: 47c815316ab605680b99980dd6497059e59680d3471fe84b8a3b1f0965e30970

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