Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b36f4b94d577467…

MALICIOUS

PDF

81.5 KB Created: 2021-08-26 07:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18d1d55a9c28f266e5b7625027991538 SHA-1: 1272b6f97c07c6d70c44a3e2225dc8e0f80383cc SHA-256: 3b36f4b94d5774671e3ad91fd04c10988c334b4cfdae1c523b31cb4009ed6bcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest the file is intended to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://philabc.ru/uplcv?utm_term=how+to+send+all+calls+to+voicemail+android PDF link annotation
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100295dd9e40---3023683148.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/lomofupijutewewidujo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/257d3693bad8c14d27b674b53b55ec8b/tuvoz.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xuwibebixisefidugugi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160858b6ce1fab---kaxemobiwinuwam.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a28b692d7---25419841048.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/57679863613.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/b87d736b1c3f0894c412c01b98a81c15/fafizeb.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piwununidirosefo.pdfIn PDF document text
    • http://saydersan.com/firma/files/93965187434.pdfIn PDF document text
    • http://swhos.com/upload/files/37712750175.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61427fa3f---vabawijuzum.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/3380424267.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1e5fbe053e4a0941ac2251d2ec11911b/10084762169.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/fevaxasokix.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/31636122228.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/65r2d56rkqhttocn5osmkmgv03/sagelabokamobitorinosezat.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6549e9392---80962323377.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/26422159878.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507014446634.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/lawomixes.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/74725241529.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8b5c26c76cb440f8fe430d051bfe3297/zerapenekexutaz.pdfIn PDF document text
    • 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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 17072 bytes
SHA-256: 60832967946c636e393e4102b18e684754c3fb704aefd5646180491e67898550
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 10672 bytes
SHA-256: eccfabb8205b1c2998ca38550519b72e9b6b99bc3813d40afc42f072eaee39b4
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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