Malicious PDF — malware analysis report

Static analysis result for SHA-256 891a7fc033cd3db5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 16:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28167fb5f311618c6b0af22f31694093 SHA-1: d8a3a9427fe3b18ddeec95318f52c7c2849fc614 SHA-256: 891a7fc033cd3db58ee794b0ebfb63fc07bb60d373c9b267dc4c07b26ad0c7df
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, indicative of a link farm designed to lure users to malicious sites. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users for potential credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/193f71f86b5348ee93ff9d2f7777266e/milebogutiletuxogekag.pdf In PDF document text
    • https://sapporomn.com/userfiles/files/bavonewoke.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb596995128---xenazuxovovugitilumipe.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eb1d2d20022a1a89ec337c0e1ba9335f/japatero.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/bekerux.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/daeabd2a530f082cbf854ab8a24679cb/vanigina.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/penugu.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/sivaw.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/97270155639.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kedeziru.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/vazizujugamusupolibofot.pdfIn PDF document text
    • http://baoveantam.info/upload/files/sijusiwusuwasamixepolodif.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zofevij.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1e82655051808ec952b2ae71fd581abc/52703633702.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfdaa6353a---39374839587.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/84651520876.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7d63ad4c---63940296387.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/zuluwemosozifajo.pdfIn PDF document text
    • http://standdominica.org/files/files/9409275098.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa94012ba---powafepiledobarizini.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/xuvowefajasinezefa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/daaae259a75e5e10773f4b28587fbd7a/xuwonedinijisibonuvi.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/maparumupavuvuzagogex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=epithelial+tissue+chart+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_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 10576 bytes
SHA-256: ffe42b149a34b143268d06237fb5cd5e452e577111534a4455d912167a224b94
font_01_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 16348 bytes
SHA-256: 91f230a409aa972765d86af05e46f20ffcf27d779523b23be281532bca5bd0a1
font_02_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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