Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab2981da8ce2c5f…

MALICIOUS

PDF

100.9 KB Created: 2021-09-01 03:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 494d36cc5dd487a9dc7dcde5870b186b SHA-1: b1750277e0f0b2ef9b70c58b4423b9b8ea98b3ac SHA-256: eab2981da8ce2c5f0d58cb2a132cc2d58ad5ab9f4495597901f36cb7163e5690
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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
  • 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://ahkjt.com/upfile/file/90796623025.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d36ddff8a9f7ef1a80fe069fc2e141c5/92823458194.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/50810228557.pdfIn PDF document text
    • http://cl-pub.com/files/files/59794260659.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607567f492b96---16633162327.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/bafipovo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc5ab3247---14956652938.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607531ddb6278---23422493407.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/57099302ffd70d380c065a7ed3eff604/datuvolele.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17298828444.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/gizabudadagoduwazo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/9808441963.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/pegabefaxamuxoxafadatomok.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/16354504273.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mtvjm5ilekk2iku4p92go9sq32/vusidokejufop.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084f07878899---94023308772.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6marbokb5d8cbhfb5bersdkgf6/dujozovukoz.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/vobabizobasit.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3a0g9tcqd7sbe3ms7f88h4pgnc/99932427031.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/76673624296.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd16042f4f---nigorozerof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rite+of+passage+shadow+of+the+tomb+raiderPDF 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_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA7 17436 bytes
SHA-256: 6e2cd53249dcb43d6a9d2299a85480ebe23b10a5bc4a536344aa1c316a0be781
font_02_sfnt_off00016b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B68 11068 bytes
SHA-256: 8f4f8cf244480309289d78909a4e2d57ed1e8e47d06c5eb7b29b7fbc2b619fa5

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