Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bf621ec822d190…

MALICIOUS

PDF

94.5 KB Created: 2021-06-26 22:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfd31396173ebcc3deab87d6bd3d6b56 SHA-1: 0b77eca99aa239ec13e3f0463cf8891fff8cdf6c SHA-256: f7bf621ec822d190e1e8ef2f19203825d2e0da2a4159d7dbcfe8af251428c9ff
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/454600c641e90e994b6f69793787bb73/91998814501.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98040660d0---248960711.pdf
    • http://bakoca.hu/files/file/74962245824.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ba429860---jefopuxabimilowitowasasu.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/48234940609.pdf
    • http://7tec.ru/userfiles/files/suzunave.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac2d0b7e9---43646955612.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7291811e47a1fd6d3afb9bb9f4a44c29/66160458962.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/o92fpcdv85lvdfdjc0489138j2/konivalo.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0790096965bb8765a7dc96e57252e0f0/bibusavotexowonujadoj.pdf
    • https://adtw1.com/ckfinder/userfiles/files/fagizad.pdf
    • http://myucpb.net/userfiles/file/puzemijixikusumu.pdf
    • http://moderncarrent.com/user_img/files/tapavodivanakugufusa.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/nen1r7ijnqr0rvnb9gpsnd6g98/77173395993.pdf
    • http://danfilenemd.com/clients/67744/File/jemutamak.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ff68dd5d5b5e8d1205d7b920cb655527/vevitif.pdf
    • http://animalscipublisher.com/files/upfiles/file/xolututefupe.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dd92923c---54325954052.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/87vmc3kubd7nndl3m6vgudqpo0/papeleg.pdf
    • http://wecans.net/_UploadFile/Images/file/17438462260.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/jrkkvljninipoo4rbfghp2okdu/pasazoxaxazujibi.pdf
    • https://pakistanchristiancongress.org/userfiles/file/16973285548.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ce067a26cc9---82342224157.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=1st+puc+computer+science+data+representation+notes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e77.bin
c42bdb169550d9a6d63ea3a83766abf0933b6f5bb8ba4e611073416b154c2477
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 17316 bytes
font_01_sfnt_off00013bf6.bin
e861d185773f251e6ccd81139ce8931e61742af250907cce9844178726d5b679
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 10684 bytes
font_02_sfnt_off00015474.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15474 16792 bytes