Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d1793596b25b61…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 21:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5004dac1d1f67997515f0d0facf5f5d1 SHA-1: a9f24c932f55a0d2f8e97b199f4f9dbcfeb8da98 SHA-256: 14d1793596b25b615a39dcace78201040f75d0cae317c4660ae059ecdfc4d0a3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with high-confidence heuristics indicating that some point to algorithmically-generated URLs and others to compromised WordPress upload storage. The document's primary function appears to be acting as a link farm to distribute traffic to various potentially malicious sites. No scripts were extracted, but the presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rowerowaszkola.pl/imgturysta/files/lomugomajonesa.pdf In PDF document text
    • http://cbcom.eu/ressource/site-image/files/jexupifa.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/gikesogefetobiget.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/16115674884.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/wofuxogelo.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/62548614874.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/difate.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/pikivubimetitoseb.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/13413716120.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f6a14c142---32473688470.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a982f646---13434865426.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/wozaxejewus.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/zuzuk.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/62129723678.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/74015994363.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/40275726026.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/narufisatirivovedaz.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/32977339191.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/9up6meaf3ptv6s9h89t3e9b0bl/wizilibir.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/10427246493.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/vixigeg.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/86647592166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=all+in+one+flash+tool+for+android+phonesPDF 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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 10576 bytes
SHA-256: 95ecbd8b5986a43d9b13410a30b7411841a7c211e71d8c697ed7b8fb3ac38cb3

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