Malicious PDF — malware analysis report

Static analysis result for SHA-256 397bfdd4a1ca09bb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 11:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1e3099d1f5f8115ed2acd1417893b8f SHA-1: c0f1e260010b728b027c726e9ec0ebfd28847511 SHA-256: 397bfdd4a1ca09bb1b54e708d8ae57342fa88fd54902b4d2ba0171134a180926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. While no scripts were explicitly extracted, the heuristic firings and URL patterns point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=fusionner+pdf+avec+adobe+reader PDF link annotation
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/69d950857855287358ab18c699e70e24/94248165115.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/pv48pg5qmr76tat5m6nlf5gq6p/88742369706.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/82478393553.pdfIn PDF document text
    • http://mebco.ru/images/file/salupajetofipixatovesabi.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/14994004684.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/dulevopaso.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4798610cf---85876547054.pdfIn PDF document text
    • https://parc-hotel.info/file/97981934494.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/saph8gvrf3egdgvipsste695n0/kufofifadunilozedilaweraw.pdfIn PDF document text
    • https://argumentua.com/i/file/57561642163.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b20190e2---demojinidadobexunujojoze.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/16744773464.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e14f6be2124---zudaje.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/73233575580.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/toxaxofitit.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210525075523074.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107030243038892.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3gsh24ab5p8bmb3fqvjgl2vn3i/balif.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ffb9ede93a5697f1afb3723d76c9397d/62733728847.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/lofuvene.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/10649245496.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/93824100497.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbea9137a38---93484213571.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/88312986959.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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10752 bytes
SHA-256: c2fc8f46cefe7e4064d8fcfeabfdb34b7b3a7f6623b8e5b76c56edf08a18edc9
font_02_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 18364 bytes
SHA-256: aa73aeb3d641387cc62bf9e6edb1b6b2b3088231bb4646ad44a8db8046ada707

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