Malicious PDF — malware analysis report

Static analysis result for SHA-256 3102b60524f2e507…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 07:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9bbf1fc29306c584c1e5ac6d6b1b380 SHA-1: 8b765267b9f7f4e7e3773e9de07ed5b69db8e630 SHA-256: 3102b60524f2e5070555d0fc0cc22d884c4a4bb1fc1499db70d98cc15786438c
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and the nature of the URLs suggest it's designed to lure users to malicious content.

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://tikatalog.sk/_files/file/55815368747.pdf In PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/42693454509.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/55461020430.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/foxisusexulifi.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/sovisawitiv.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/cf28ae1e3c5fc30dfc90aa80ab68d0b6/92623411489.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/78053765606.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/wasibinexafekorusik.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3c5a88510022ceae53f4575f7cbc49e5/dibojanojiviw.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3828068b---72383538854.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/25298844913.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/47102817685.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kre6c2u0tmoa8jur4a11mmpnl3/32381423567.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d0fcbfa5c---juwiniritujoritapamiril.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/af78ddeb27baae02b10ead14eb3601a4/ferisububamose.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/saruvanedeg.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a675dbf333---nabopujoturibenobovos.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/a025f3e42ecdc16f4feea78cb5545df1/giwamafaxunub.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/20697165806.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/61694058935.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/nigob.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/femekikelut.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/20f34c4b8c28801103b3c8d746e036e8/jewaguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=center+pivot+irrigation+system+design+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 11008 bytes
SHA-256: 5bee49cfbd82ccbaf36bd705908dd28d0c69ccf4483e3a1dd4220bf99cb9fecc
font_01_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2
font_02_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 17932 bytes
SHA-256: 3d10a4f649486ec6021e36c5f54717e5e78b7f55469cc249f1caae542a84014b
font_03_sfnt_off0001396b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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