Malicious PDF — malware analysis report

Static analysis result for SHA-256 94af781a7939d028…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 00:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d55038927bb9ce660534d936f13ef5af SHA-1: f68a16d2b7f92aa617186bca35499bd9dbfa06e2 SHA-256: 94af781a7939d028d48135932e34441e0f11a0b73f1c3570520a9cceb8285c0e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=pdf+document+icon+png PDF link annotation
    • https://shiphangnhanh.net/uploads/image/files/63507073330.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5421daa6---pinavageratilib.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/sdm3eivtrumgoq1kposrb7u5kb/56349209653.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kiladipekalunarabefuso.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/86251737554.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/magutexivewapamudokaraj.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/laieok7hc86on886s4a690l5f1/nagawadupurowulotak.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/67680310019.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/munumezemikoleseve.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/88035841611.pdfIn PDF document text
    • http://www.celso.org/download/kuboxuwirap.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/4732191134.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/jedotogole.pdfIn PDF document text
    • https://senhewood.com/d/files/69904988553.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/gatipalebotozoxe.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6934c34f7---38788434935.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/959728769.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/nisufogojegisotuzefutox.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/lelabodufenemurug.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca68ea555e---1007055449.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/14907645832.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/39680038753.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vpmrp6dm3iqkm8ed0anhodrr47/bozosolalil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 17308 bytes
SHA-256: b2c457d73b7391cf69cd9badf143380a3871460a71a8258f67f9beda41935939
font_02_sfnt_off000121dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 10588 bytes
SHA-256: b1c3083823e1a644341e2218ddcdeb8e4e9ff09a75531cd49975bbea1ad286c8

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