Malicious PDF — malware analysis report

Static analysis result for SHA-256 573d0124bef1dd3f…

MALICIOUS

PDF

138.2 KB Created: 2021-07-02 00:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 81e8ec643f8da8e024e4bc797c9c91c1 SHA-1: ff094195e182acfc25e313bdc9c118a7d0b80b9f SHA-256: 573d0124bef1dd3fcccedebc5c118c88036f56396da29d90845c42aeee9a37be
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This pattern is commonly used for phishing or to redirect users to sites that host malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://krisoc.ru/uplcv?utm_term=sexualities+similar+to+asexual PDF link annotation
    • http://thevenetianmask.com/clients/71561/File/jabiruve.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5qd4f3jbj0h9b12pius6hm1l7c/xukizuborefexukedare.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/jemavonasimuleju.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/xaduxerana.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ed90550e6---44090401214.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/78285558602.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/d36cdpnf6r15sgd6bl5sogbv82/40157975084.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/18680188467.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac930ec62e7---rukutokax.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/04304ee6f7a28280dcc60f6223a8d5a4/15069162521.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a6971e4d8---91557878860.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b9268ae8---43631446935.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e98d799bf---49197732490.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/20f801088f7b381402019a4a50fbf2f1/66388897002.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/xazore.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc24aea856---xefekolu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a3ea5de154398ac9e1e761f37ad9d762/53520480759.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5pm8g3fd1bk4a10nvtdodate37/47161906256.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d02b41f9---mabonekixula.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/91017n6ah10tbe7o4n4afm8v22/50631236881.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df2815b23d---wekolesosisogesubapufoj.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d12a1775643b1c2dbeb23c15ae04f9e4/95050257597.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8e43f599---42608927604.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/zanijoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC8F 18252 bytes
SHA-256: 53400f5cda4a5cb7faa07f0752f43eae4d2df09659c2f90fcfe5f45cb4151edd
font_01_sfnt_off0001eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2032C 10444 bytes
SHA-256: 3ac967da15756d4fe20adb367abb6ef963e046fa72f945b443d525618d01e781

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