Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c455410bf9c86a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 05:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b0bb292f38e6e55caede08f61eed4743 SHA-1: a9032327224619ebca27c1cf8cc05c8e48a14e36 SHA-256: 96c455410bf9c86a2b29fba8ecd3f0011c96fb1187c7a6124ff85e3e08bbd91f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked sites. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160af884e83695---vewozufil.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0a7b04a1648f8fca3b71b10ee39f508f/dovixaxiwitupetakebogepu.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/mevujujiwovore.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8572b57be---75212769622.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/10598536892.pdfIn PDF document text
    • https://dafelia.com/files/34756795359.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57b536116---33910602774.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25e7532b13---xeveletikaxirunij.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r8q9c8u8q2g5hd4vjetag63jnb/dulomifajodadenikewa.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/juwefuvipifififofinop.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/87398722563.pdfIn PDF document text
    • https://braus.uz/images/shared/file/62551282398.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/abd5415bcb568dd2c30495507aaf0a99/dazikiwatavivib.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/navovudisev.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64c4e2668---pijorapukiwunumazakawe.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/wilikorexozezum.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/33525151318.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/17880231613.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1624019377.pdfIn PDF document text
    • http://thaide.org/userfiles/file/77167773580.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/28d51d634908002fbeab0f0973218628/62894307243.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/bonurabizeg.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/bopere.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/fifatepenapolej.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ccbf1f43e1fac1f2a76706950b7abeac/budejewixatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=abuses+of+statistics+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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 17072 bytes
SHA-256: 47f4be0315cdbbe4e91baca6d0639b6b0d2000dac28de623838c03981ec53468
font_02_sfnt_off00012fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA3 10584 bytes
SHA-256: 1b321cbbf7cbde95b30690594009ea4336117b66789c9f6160e234585905cefe

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