Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d731ff40cfdbeb…

MALICIOUS

PDF

144.0 KB Created: 2021-08-01 16:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9783fedfd15f4b85ab45de753131a0ee SHA-1: 34c9a912f9a58c6c0eb3d0dcbd466087d188d629 SHA-256: b6d731ff40cfdbeb772152bafaf0ffed76d852be1c6b2e7f9c6dbb11565e83fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983f8a816f3---pinutenebubalazarufajipa.pdf In PDF document text
    • http://velocimapper.com//webfiles/file/munawaj.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/dimuwebokod.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/zaroturukumijenava.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160940672bfa28---sofelutedodugi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16092b6504e1ab---pixila.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/53728643178.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/55749340590.pdfIn PDF document text
    • https://susta.vn/userfiles/file/foxijep.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad23577fb76---6391312904.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/74161104351.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8fdd13b1ab63238bda1582dcd809669d/38818835471.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df01fa50c72---90677979819.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zetajujupamoziz.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021052810454274.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/fusunidujuv.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0051a784e---5129575301.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/nibikeduzipajaximefileg.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/52505949514.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/edb57a2384aacd6d09a5b726a548c9dd/54981923170.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/refiwivipasajoveni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=metformin+er+500+mg+24+hr+tablet+side+effectsPDF 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_off0001d1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9DA 11508 bytes
SHA-256: 5c2f0bf58e43af9c2d190a64ee17d8f4682e49e9d573e0c2e22c64a12970734c
font_02_sfnt_off000204d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204D3 16404 bytes
SHA-256: 7d52d43aceb26edca630aed4588a7f38c634f5b34a03299b73f6a56b89a4c741

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