Malicious PDF — malware analysis report

Static analysis result for SHA-256 35844c62e58a1f78…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 18:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9caa6ebf15ca514983b37bf92f814635 SHA-1: 0e2f1a8e091041fa8808bbd630cf4a2b5dbf87d1 SHA-256: 35844c62e58a1f7852d78de6948df4362448e7746104c280fc7f9d0105446316
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.propper-droppers.nl/files/file/28237226959.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/620a2f4a8fc5fe4e02badd4648a69c6d/devetuxeforanonugepe.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/vipepa.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0a89ad934a2f1f381897e71326b4b612/90289922186.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16129cfe84f5d0---xanezu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/33b8fdb554f8419f89710e8819f95f4d/41516130510.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aea97b597---dodibusu.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/43383952841.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/45546287937.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/rofotojesejed.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/zenumunibemo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0059cdfc---62086415319.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5c1faff17---renixanokutodigemape.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/dekuloxuxisukeweb.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/2394448648.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/91722073505.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/60161703863.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130fac5ccbcb---1898400117.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/9802692099.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/dokosovin.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a9dcf1268d588b39151d4fa8e4c1d6b2/suwawenuvokagivupejuliv.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/70867841089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rome+iv+criteria+dyspepsia+pdfPDF 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_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 18660 bytes
SHA-256: 4b458928761af1ac6fd650a79501c1802467bceaa9994d47ac0fa51859e32262
font_01_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 10856 bytes
SHA-256: 00610c98fe3bb4d14b8c6137aba38c44f6a3be6737bfdd2c6027cb30e19ba91e
font_02_sfnt_off00012e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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