Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1aa62f6d893673…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 05:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3a238d6cf3991139548acf8bdd1a85d7 SHA-1: 84ef26df49628c840b82f8d9c78d7120c3f88d9f SHA-256: 0f1aa62f6d893673725594f0ede1e6c1fa42e43633062549dcd2047b9e3bb272
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rubin2000-distribuitorshop.ro/userfiles/file/ragizukuxolemagag.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de884e20d0---43055709260.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kls5phf0k87o5mojo81l01snd7/13030094005.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/72382402399.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63960adb8---65176513395.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd8ae5566---27681858265.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/gidapewofimavofogel.pdfIn PDF document text
    • https://majubesar.info/contents//files/xokuzitomizoxixeler.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/24784558132.pdfIn PDF document text
    • http://tms-operation.com/upload/files/18838990448.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/02af498e2573fa1fe7e6963a0ae86a63/gumajefatojuwujawu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c7d764478---kitezopobevabevume.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2d485121d2218887ac4dd68b6fee9ac5/vutevifitonolusenemojoni.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/46767553513.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66581f1804---vodaxedevilix.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3b622f75b8d88ebfde53240b92d7dd67/85353762444.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/88th7cg7iq4s5t5190t51c6jjq/ganiwifuragadevir.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/08ec57de496d01cacdd2dd291934a3ef/26187343394.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6babff92d0e632d59623308c35639e6d/39123599681.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/4c5e6890663aeb1faa3670c791e8ec4e/sukuz.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1740a53ec57c55edd816102ec45b1b88/35519460902.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/59c61d09d8a763e9c7e3ec0409409b49/gadatuwuzumenijopibogawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=image+classification+with+cnn+using+kerasPDF 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_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 17384 bytes
SHA-256: 07b4beb70568637bf329aff06c17d2b699ec4447677518a022e19df9ddaa5347
font_02_sfnt_off00014ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDE 11012 bytes
SHA-256: b355dccef172982b84f8a86254e248b63897e42ffb7e5bb059ff716c4d8a616c

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