Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf9f3081ff85a50…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 21:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 338d48de62db305bee65fe0a70b9f481 SHA-1: bf5f116243289bd29efd8f0ed3f671a10039439d SHA-256: faf9f3081ff85a50725ae9535ca7151d57f7c207f83caa844097536a8028356a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. One URL specifically points to a raw IP address, increasing suspicion. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://montagnobozzone.it/userfiles/files/7424711620.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4874a4a0b---81899692961.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/39666031577.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/pinuvozikiterozivipupuz.pdfPDF link annotation
    • https://studiecarriere.it/uploads/file/jopegilumolagidurosixejew.pdfIn PDF document text
    • http://terminsk.by/pics/files/medubeg.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/xutobisuzukunuvi.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/47510553161.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/38131124551.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/femewawebo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/9fd30a29a96e0ac8ff7bfd7d796f0a20/27095414.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b8b51a2d388e89933e8d0c391c7c9a54/1869505562.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/31023626090.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/botarudorugez.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/febowavo.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/zavod.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/wiladiwolev.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/10486205244.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210913_120214.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/65229213619.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/092eb27de66147f4a900e8b9468d14a3/32536620971.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/061137079569.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/divabazasaxogetikeboje.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/pufawurolaxikif.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/46293215209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=yeh+raste+hain+pyar+ke+old+moviePDF 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_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 18308 bytes
SHA-256: 84adfc8099ce064a760042fcc4ca0cd2c3f822cce43b00fa333131692d7a35b5
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 10912 bytes
SHA-256: 193c9fbb3626aceb9754883d9dc28cdd598c12bfdd542e702fca41850268a128