Malicious PDF — malware analysis report

Static analysis result for SHA-256 a403aaf7d8e316a7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 14:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07c2ce22fba509801387632002439b0d SHA-1: 0405d6a845e0f379ac3b8bd2780250b2af81b9c3 SHA-256: a403aaf7d8e316a7bbc4985caac91a96de2c8578482239736aab253b98c0d96e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure points to a link farm designed to evade direct analysis by distributing links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=k5+learning+grade+6+english+grammar+worksheets PDF link annotation
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/a3e25562b82c128c5501c33e2f525aa0/ravovenamadopar.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/75489792072.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/tizawizutoju.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/4760023060.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zogutitedenud.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/bl70b7v9mh6v82tbatj2v7ajmk/deroronog.pdfIn PDF document text
    • http://gzhs168.com//uploadfile/files/ninavofatujun.pdfIn PDF document text
    • https://termoformat.md/img/files/konaruvigirizinemu.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/8983097244.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/dijunorotinebofenarejewe.pdfIn PDF document text
    • https://ijp2.com/contents//files/27917657274.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/9d16f17cc1ac53e1ac0b920e0588b138/15867941754.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8671a29b8804df47fae169be3ed7a735/26995599277.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/vujarujiduzoxonokope.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/bidezulirikofagigar.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fc493330---nidosajujojuwuzuxevin.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ij3p5n3qo9vkdqe24egkein5fc/12381245520.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210818_D055FF08F28EDD14.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b744c602542---lupijajafimamutap.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/obpur96rifp7kgftjdqporjfrj/66815451703.pdfIn PDF document text
    • http://candientushinko.com/images/file/bumizoxakovunujegetupiv.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/17365269726b60367918add1693dda5f/73530799154.pdfIn PDF document text
    • http://canoeing.by/pics/files/bibup.pdfIn PDF document text
    • https://lapdonline.org/file/12837624577.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_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 17404 bytes
SHA-256: 40287c18309e4a28d04667cb2673f473dce723866e71e04d046b24c3a105b5b9
font_01_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 11168 bytes
SHA-256: 58772a43cd82854a8fb947defba09bf2d67418d98099adc33c41bf1019612603
font_02_sfnt_off0001341e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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