Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2078c0c028d425f…

MALICIOUS

PDF

76.9 KB Created: 2021-05-16 17:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6fc333d125bc5f224248573cf3f4bc9 SHA-1: b96f87de15425e55c5c1f598d24913aababf8b61 SHA-256: c2078c0c028d425fbed65f5fbd82400f6e4507d90946a74c802ea430916ec55e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=adventure+labyrinth+story+guide
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/c5m5u29csirt66jtlo9pdkq9go/20842419730.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2cd61156---numupimigeluxajeja.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735d3d65b8a---52845685063.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dafd51bd1929411ea5617cae65ca3f00/lokefudugodoninizuz.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a40d5c8a2fd26e72dc16c499d6aa7858/70395285543.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d0fe55486a390283dac6b809d0a83ace/livodagibebinesig.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/008bd375463961c3f266cdbd1f92b737/46731576788.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c9e5e9da---lerekugosavibu.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1890bd04d---35798170683.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868fdac7968---rokenutoxuzewudesebujivi.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e196d56---pukamibejelago.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079262eeea87---zisametot.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2af44d3f---lotuzurizadakikiwete.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c51f9c28bf---34097793910.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/4cfc2a822c1010b6e30c40a57f1599e4/wazaxigobololejuraj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/41718d962956589d3a8425522f00fa91/xuzawurixemis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6d.bin
6eedae6daed35e597414c4c980cf33b6dd19430263e32bdf549c340fc64a81eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 5380 bytes
font_01_sfnt_off0000ffb6.bin
9d7b33b5d77586146fe8fdb4a5597f204f9671fca0fd80f2b09ad8a26284d88c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 11336 bytes