Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc5612164488f35…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 15:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb35e0f3b3b485f11f97058a9faefafe SHA-1: 4a3c8223bbd105979c1494ebee65e8f3f99e3d2c SHA-256: 4bc5612164488f35d56f5458ce2466f7542dab984ec85d97cffed8aeffd935a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to download further malicious content or engage in phishing. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://hamayeshniroo.com/shop/file/96743437680.pdf In PDF document text
    • https://cottingham-group.com/cufiles/files/96029449136.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/85434311414.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/21389581730.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/jigisigufozimenetukig.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/kepevolufok.pdfIn PDF document text
    • http://sdes.in/uploads/tonas.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/89669886096.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/susemululuvetarulajirine.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6879c2138---23021943949.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8315fd777b23743ab5cc9f5540e007da/vobuxoviguxuvobakusuwuxiw.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/nafagesexakekekireruwun.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/sigokatagosovab.pdfIn PDF document text
    • http://tion.hu/upload/file/53234200447.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/54279474457.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/vedadusitako.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/57041919741.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/13256432298.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/banif.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/xurivedebesosonenerape.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/9475743840.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/febetetosapuvorumas.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2fe18e30d---9135407790.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/rifaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=manage+background+apps+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 10868 bytes
SHA-256: 3f94f083c8c0369a6f01ec2d86738808b7d39761a864bf3fd9778f063a1b912e
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1