Malicious PDF — malware analysis report

Static analysis result for SHA-256 0444f63815687403…

MALICIOUS

PDF

88.3 KB Created: 2021-08-09 20:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 498091b3a77f19ef6b39e14824d2132a SHA-1: 101e9ca33fdccf36d1f92052ee7dc2436a5fc0fd SHA-256: 0444f63815687403135edeb786339a9d921c3fe69996cd34ec004bbc6d631370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a link to a compromised WordPress upload storage further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=how+to+connect+dish+network+to+internet PDF link annotation
    • http://hongshengfish.com/uploadfiles/20210805/210805112432670130e8hd1hg9l87z.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9vquc8jtg8e9m2p2pt8osfgoco/vitukaketofikikopekole.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1623205343.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c8037bcf482446a174bd2093c81e6eb1/19550242147.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/jesazonimubavobi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf75cd3fd41---nepijikuvilojenikaz.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/lisobo.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/nogibenur.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/42f73520988ce92e6859150d64e896d9/2844595609.pdfIn PDF document text
    • http://daydala.com/userfiles/file/74758985341.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/sesazuxanogodudapis.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a3ef6f4db---43959436688.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/zumaxolutufurisu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c38c7f3f53---nusexuwevugolefizalo.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/7726769062.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/48061928924.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dd6c52c0a01a57ec8465dea9467b6649/79584692604.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5cfe7fc82a77ceea89e8ee6940318fbc/48019612177.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/94502228626.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/643a3889d904f74e39a45da777f7ccad/fugewiruboxaxorera.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/dajulegoresako.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/dotogiseva.pdfIn PDF document text
    • https://menu2uplus.com/images/file/65607093582.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/43164108583.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_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 16952 bytes
SHA-256: ec51da7f837fc5d1494bd581b23e632d0f95eab5637a7894630894bd288be34a
font_01_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 10428 bytes
SHA-256: 9f6fc6293889752e9d434738e1c339373628dd5f20e437aa5751b64b8c229cc4
font_02_sfnt_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1