Malicious PDF — malware analysis report

Static analysis result for SHA-256 3512e928664a3ca7…

MALICIOUS

PDF

86.9 KB Created: 2021-08-15 01:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0de7535adb6500610571fbcec725d97d SHA-1: 6ca94a2a6b3152518577fadc48b4c327be23c245 SHA-256: 3512e928664a3ca7c0b60cd50e864452b04ca8189bb120e58f65600486b34e0b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs and the nature of the link farm suggest an intent to phish for credentials or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://virker-ikke.dk/files/66003273807.pdf In PDF document text
    • http://to-tuong.com/media/ckfinder/files/xijudokoxefelowilemosuna.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d65d70c74---laginalifikejaviwifa.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/de363ed5b9e2bf69a537631f90b3d00b/lasoxijowapojorito.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d31dab6fa---lifiji.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/tejimo.pdfIn PDF document text
    • http://thaide.org/userfiles/file/sujama.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41f505fd1---mowidewixosivuj.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/51691915819.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/gd8vhjbeg93ach3hqlbmm46ecg/64014924040.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/e448b4cb58d2b2dfc8c26f1ad4bcdb28/48841798644.pdfIn PDF document text
    • http://skomi.ru/img/files/file/purigadifisibenom.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/42191415536.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/69175199889.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/zawiwosesapufakedav.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/384f60f85555dcbb536ea6e87df19052/nuzagiwegu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e39e72438c84ac99886eaadcbd88fab9/60236117762.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tnhilmfjubapsd8c8napst4i9t/pebokebiwanolobifuzop.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/tidipabe.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091cbfb4dddb---bodegosige.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///batoji.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/pobal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+into+costco+without+a+cardPDF link annotation
    • http://irodori.kir.jp/files/file/nutugupiwe.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_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 17532 bytes
SHA-256: 7130eaf323a3ed3f3ab2c583f9c3058428637e38dc4507860a9a241fa26c1265
font_02_sfnt_off00013489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13489 10780 bytes
SHA-256: 6ea1975dd09dcda664b5b8714a2c4babe528fd9c4f6251ae628f2e89d284b036