Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8f25fd0a2728be…

MALICIOUS

PDF

83.2 KB Created: 2021-07-01 10:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9da29445302d1da8f59730dcf134794c SHA-1: f77f2e08baac551af91a1cfcbaf8c4db53ca1d13 SHA-256: 3f8f25fd0a2728be3b4792c319d9a10ccbb4fd03eb98d5a112b09b0ba229900f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=find+the+coordinates+of+midpoint PDF link annotation
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe56abb01---bowadoretexizurajiwonaxi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/4332052080.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/40383950877.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1620973877.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/99867612252.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d58793fdb---44887790177.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/519422a8aeb3a4f4fc0395ef3c24726f/49744366189.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/kemozutazulibibupupuw.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eab0e977c0---42578915534.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/sisisipijovivixofelat.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607103185e74b---35345987633.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3638fb01---fubakixekimewisafaguvu.pdfIn PDF document text
    • https://kede.org/userfiles/file/23395707129.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4dbf1542de41851cb211090838f5937d/walomigoretal.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608343053d3a6---musalefibuzugudezip.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701f1a4cacf---tevodepurelegu.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/58015310748.pdfIn PDF document text
    • http://zimmerei-possert.at/gajuliwovopodirawe.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/af1d02a3d66d7a9f03779788c61a58bb/83036435388.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/puzosare.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609decb89fae7---31815418989.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/84513159978.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_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 17892 bytes
SHA-256: d96f544e383597351d0d25b5044a732cc80ea10242ed5d6c02ea9ee39aad82bd
font_01_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 10816 bytes
SHA-256: 70caf468e139f90a102e027352d6a378ce235b9c3048965be06d1d1a5b83bd55

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