Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94a8e4cb783cfc8…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 05:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f3feca0e25cff0002fccd53504f7b29c SHA-1: 49376a35dd0714004b85b8d5f7b5c2049a480ac1 SHA-256: e94a8e4cb783cfc82627c5a4d8eb6bebf89a1d0c3f4e98da1afd2807876cb088
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a phishing or malicious redirection attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tedolumusapofexapesuni.pdf In PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/memisasobo.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/31590777315.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/vurejufefizuxikeja.pdfIn PDF document text
    • https://melz-feu.ru/upload/44215187205.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160775206801e6---muwemimup.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210615231656.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/37105854062.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/luwabifabafebelerafoxi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb86c4e4ea---59628794906.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090660a50e06---ralumoboxunoju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161081b3bdace0---bixazuga.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/papebuliz.pdfIn PDF document text
    • http://drironcat.com/images/file/vutuma.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/defetatawujovadiduvivuba.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/novorewigimuwamatinimise.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7e06667479874620ebd772db08bdc957/gavaxilal.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/52272988586.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd661cc265---44333427793.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/25555343548.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1a56aa46844c7be517fae3f088e53576/61185048857.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/36147818100.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c291bad2a57---ganubamolakurefo.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/73484810972.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/44059111115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nauseous+meaning+in+marathiPDF 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_off0000be9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9D 17520 bytes
SHA-256: 5358a37ba113a92440a49faf43d7fe01a3727b3ec85e686e4220bc7570f69dd9
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 10584 bytes
SHA-256: 1721908f9b4c095ac3b4227bbf7dbd869fa2bc57c5d7941f8424e0f3259ecac9
font_02_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1