Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8fbe585ce7210f…

MALICIOUS

PDF

87.9 KB Created: 2021-07-08 21:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3adfdf4b39e139f3a2ae2561c55bd9bf SHA-1: db58ea3fd95095546c25a495f342ba53be0088c7 SHA-256: cb8fbe585ce7210feb7a029df70ecabc3609c0b1eb6c19f822e9ccf3af9f634e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, with a high ML score. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://fotokeramika.bg/userfiles/file/78994856061.pdf In PDF document text
    • http://lhsclassof1971.com/clients/74120/File/zidenedatovezulodis.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nar3ckqqm8l1vsihcsnblsmpae/gixibuvefidudibakelilugak.pdfIn PDF document text
    • http://www.moyekolodin.com/files/92782114420.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/72080762681.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d5304a7b9521fce4203c28ea8bacccb3/26493175664.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/96097434897.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kilitox.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vgs2dn8dr7ktm56uh2egmhjger/61181908597.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c590bdb24fe---40975993831.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/69747571070.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/81088261825.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8fbeb4f0---tipetadofixekugosedunig.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/56840140389.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/41668866141.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/12692791531.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/pebamejunuwodoruze.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e2b2b4e3fdf2dd732498cf85a67df2a5/12273068890.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/bajivujip.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/e7cfa029f714628bc48016e386f1c59b/19184283806.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/34506731825.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/59250524709.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/81162843588.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/9426059075.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9dddd81d4---fudabirufokemalovelekuwo.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9f0bb952d13e3903aa5df43dde2d8265/jakadazusuxefedus.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xuwunizudakorifiduvis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+sell+the+half+track+in+gta+5+onlinePDF 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_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 17820 bytes
SHA-256: cdea8edf8a9f490bfa632d50d769c2b07e7ed395129db55c526fbf3e572b3c4b
font_01_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A5 10916 bytes
SHA-256: 75edc0f9ff0fe171c0cf7a5d12a9dec9d766d84a0ffe5e70ed3f2507d93cf113