Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc806d34166ef9f2…

MALICIOUS

PDF

86.9 KB Created: 2021-07-31 09:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b1cc502b0db8f6cd980a23531bb44c0 SHA-1: a473d0ac54e9b70a5ccfb2cee5759a919fef6112 SHA-256: dc806d34166ef9f23f75d41d2267c26345296d5aa2d17039f3c8717710d9abf5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting an intent to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports this, indicating a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://archism.ru/uplcv?utm_term=incendies+wajdi+mouawad+pdf+english PDF link annotation
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/6qeeu6c306me43pajortbhpkc6/pudemi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/29507033876.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd0c11bf50---wezaxezutozudinikakuvador.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/9182348437.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/74648811484.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/26010445576.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tanidizizazonuwenof.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gufis.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/25354509492.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ff9a8df989f59987229aea1695dc6ea/39944679133.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a72c1275---kifukogofupug.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/linulubolujowutefavu.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210704091839.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7ff4209b---21865131475.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3ef071c5f---64057543375.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//tifefipafebabebakuxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89277dee33---zoxiruderowesuveganiwezo.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8db59a422---pisosadorovilogajujidalut.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ebf1860aec658a10d44c8b07b077d16a/92036749294.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/0b8a9e8b0c0909459a866fec048f8d46/pupobetaneteruridudobub.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/zadudewimuzasosis.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/um1gmbmr7ujs3vbbo54vi1fus3/74431804627.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12377774942.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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 16908 bytes
SHA-256: ecf8ccd9a5f41e2e7a854157a4b68a59232ff3ca396acab4bcb5d68860cb37f0
font_01_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 11136 bytes
SHA-256: f8b40300f21c7cc64e9816ee9554629bcc318cc88f733938c6f146cc2744ee08
font_02_sfnt_off000133e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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