Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3df086bbd984be9…

MALICIOUS

PDF

99.5 KB Created: 2021-08-08 14:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 10b94df2a81ad1ba5375fca589dae7ab SHA-1: d09a44765d6b437184fdffe1fecc875b52caf210 SHA-256: b3df086bbd984be9a7e057ac58f0d5d3f06fb9bc1dfa9075d9c9489b7237e667
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://incoyun.com/calisma2/files/uploads/42239723423.pdf In PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vn89gb79jdmk3vtn31g8l2eafo/kurolumip.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210627053550_u959jo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844420ec666---lipanovixeximujedexo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b78c942fe---ranuxupelubem.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/wupirewodeni.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864392248cc---pazitafaxovaziporifonegen.pdfIn PDF document text
    • http://fskyok.com//uploadfile/files/ridimekategor.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/99913088328.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/jokigukolokixuputif.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/79371867827.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/97940118714.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/jodizofowazepotexu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b9eb8be7---91568144816.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/58260016079.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rubalavepudanaruvadima.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/19013875435.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/bagajunowewumega.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/76264904283.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/30b1e0ac3588d82e93f308c541abc864/pesumanomexawamopezevukif.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/84397133566.pdfIn PDF document text
    • https://rajaunited.com/contents//files/ripavoma.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/or1om4h8erscv8s7p9sbpr9bp2/38358194086.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de890610e1---45820315923.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/687a310302cf0ac24741b285f36b1025/bolevagevowapuzidejivava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cours+d%27initiation+%C3%A0+la+logistique+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_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 18992 bytes
SHA-256: fa8d9485564a182678d581da7cf2f379e02391ac3c2d5f0f4e23ce30d7dd6a78
font_01_sfnt_off00014c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9C 11168 bytes
SHA-256: cb5d6b1051842e916ee18e5c29bfff85ef88bb0486355b09ce04b008a8527f67
font_02_sfnt_off000165f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.