Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8cec59706efb77…

MALICIOUS

PDF

88.1 KB Created: 2021-09-15 21:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b14753230102e56a5cfd72d562bd570 SHA-1: 93aa509789987de4e8af4051d20a6edefb768eb6 SHA-256: 7c8cec59706efb77e8b6ca3bd98a3c265e0f5502272620fce05761b46db4b946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=how+to+open+terminal+on+android PDF link annotation
    • http://panziofabian.hu/fck_kepek/81011118366.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/dabunepi.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/86903743584.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/62382105266.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/5339317584.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/39268681687.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b92e6e6fd---wopewikakujiwe.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/acf84833bbda8fab42fedd3bdcf1e210/viravapoze.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109040036032753.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/fajafepel.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/sipepubugewi.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/mizukepojulugizinonuw.pdfIn PDF document text
    • https://wrd13.com/force/file/44239545177.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/46220820480.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/diribelovene.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7bb3cf1de749bd0d658bb04239415d06/bazubowex.pdfIn PDF document text
    • https://halkum.rs/files/57037015556.pdfIn PDF document text
    • http://fructusartis.com/i/File/67842159963.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/luserovixobakipa.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bh8q44ucmrt5djg1gmom70hrm4/59150814141.pdfIn PDF document text
    • https://techlan.pl/files/file/98956703226.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/91784233989.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161350269d26bc---95097410289.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_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 10460 bytes
SHA-256: d2ab8da7a4c86bb43e763ade9ba9552913c32b16a663a302c0e357201b97ddf3
font_02_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 18524 bytes
SHA-256: 4437a01c665e81f0fe99e2e5813f4ab888331b689c1a7aa4486df0905b7a8b7e