Malicious PDF — malware analysis report

Static analysis result for SHA-256 2611539353530fe1…

MALICIOUS

PDF

92.0 KB Created: 2021-06-28 07:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1557424d43e8a9da9a01b4b2ed922131 SHA-1: 7040d431fd8b97fdec0868c7878d739f46b7c5e5 SHA-256: 2611539353530fe188978c06f79d8a52efa399fafeff5ab36005e636891555f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to various compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://smidgel.ru/uplcv?utm_term=parallelogram+with+2+right+angles
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086da3806cc0---welesologedebog.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160af51ac34a33---vufelif.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1a57064fb---42397804310.pdf
    • http://cherryontop.pl/upload/fotki/file/xatifisalosal.pdf
    • https://harkakotony.hu/UserFiles/file/216581540.pdf
    • http://studiotecnicoprato.eu/userfiles/files/rosewedovove.pdf
    • https://beautyyaurient.com/editor_upload/file/11541417836.pdf
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/busimisikisep.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/703keeqe4hnpguo1467krii07p/69064502641.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/61b60a8feaa58cd184e3cb2205b932e3/18187021439.pdf
    • https://morabia.fi/images/file/24094560787.pdf
    • http://mywayrtk.info/userfiles/file/71583495381.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/34661abfcb96d04c79fb455dfc78181d/88859573228.pdf
    • https://fablab808.com/nbloom/fckuploads/file/46228171082.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb261806b9c---zalifepitirinopafep.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f5032d8d8065f27eba069f46de57dd52/wefovilinadawejumovitigal.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fqd8htvbolumb8ucdl4pmthc2t/41654580245.pdf
    • https://iword.de/userfiles/file/3863770285.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c67f551a1e---sitopisagegukawadapita.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/umdil8nt8mnp17hru211q3uq32/91920516824.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607289425bc07---danudufotozet.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977aa994c8b---fidasozabovajedufu.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7nkbcajt46pbrhmg8celeoa11d/filubiwarulixu.pdf
    • https://alnahamgroup.com/userfiles/file/benonomumelobuwofa.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/9604c2dccf25c135f1134593ff8158cf/82151890030.pdf
    • http://xtra360.net/campannas/file/50114943715.pdf
    • http://thedigitalscorecard.com/userfiles/files/kojilokajinitafoga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8b.bin
35b93751ff82872fed1e29d4e3c254f9b8b1b345bbe8be29d7a0f6002dad39ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17368 bytes
font_01_sfnt_off00011b6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 16792 bytes
font_02_sfnt_off00013380.bin
33cf482c297d6e057c5791503fc06a0781002495653a3bde211d30dd14857dca
pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 16212 bytes
font_03_sfnt_off00014949.bin
e97db1c67278b62aadd4b88421fe511bf0d6daa9d7eaf34664a63eb9759517c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14949 10760 bytes