Malicious PDF — malware analysis report

Static analysis result for SHA-256 a232a55c0b5b4a43…

MALICIOUS

PDF

76.0 KB Created: 2021-08-27 02:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8550aba4730b37075e05416411f05c38 SHA-1: 14aa20fe6246881410da73f920230059ff74e4c5 SHA-256: a232a55c0b5b4a4356a461c0df494c7499362ecece2cd5f1eb4012b35c35a83a
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded URLs. Several of these URLs point to compromised WordPress upload directories, suggesting a pattern of hosting malicious content on legitimate but compromised sites. The document body is unreadable, but the structure and URL analysis indicate a link farm, likely intended to distribute malware or engage in SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://kibbkw.com/uploads/files/nejosezeregerolareja.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c915f1276---kesidisuzoxowinakob.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/jedar.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607767c043411---52477778207.pdfIn PDF document text
    • http://technocom.pl/editor/file/xofugitimitumi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160784cc61ad83---33724988891.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f23dac3c0---51798345758.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/81de796180f45326a8797d22c0ebbc03/worusefixogiwotafojizuvo.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/kurujulen.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160acd5ca5addc---36991451900.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/tatotakivenugejomigigu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da335f2a8---45583169854.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210815_390D071DA4BF0023.pdfIn PDF document text
    • http://palami.by/images/file/puwigow.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/papunubejugibijolas.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100009458791.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16114928bc6391---donov.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/62a59ce0edb577bde41108eff8c196d5/jefavidepebiwojax.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083333f28e7a---poberotej.pdfIn PDF document text
    • http://goref.ru/files/file/36114790388.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/80769394011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=count+by+10s+singing+walrusPDF 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_off0000c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 16368 bytes
SHA-256: 112c6f1f49e4a3e585ae6416e8ccb46aff0415f62033bc6ecc0f2908fe64d6fb
font_01_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 10796 bytes
SHA-256: b6ffdac294302d031668ea18a6422b5dc81e088bee2132d409349de4564114ec

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