Malicious PDF — malware analysis report

Static analysis result for SHA-256 311f6f9c64ad2578…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 17:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87b058ea38127569c11279d4c482db6a SHA-1: d88d103923973131943d303daecdcf1cf8e134d3 SHA-256: 311f6f9c64ad2578bc1c5b70df38863f50bba0e9e4aacfb7a756b89259d263c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The primary URL, 'https://huntic.ru/uplcv?utm_term=list+of+vitamins+and+their+sources+and+deficiency+diseases+pdf', is presented as a search result for health information, likely to trick users into clicking through to malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=list+of+vitamins+and+their+sources+and+deficiency+diseases+pdf PDF link annotation
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1980f221---56927077777.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/71144272432.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/disovepolelubudikipeviso.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/sugetimawaj.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/pueauve1ub6to357flkn3ljaq4/pixivusovebe.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1gn0sioh023mqj6kdg8e5jglum/63253224174.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/64tb23fjs7ohjbpe272dlkc1u2/lewiwu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0f55ef4220f602c66d9810e4a65caa07/xisadebizuroxipugegok.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/54674023565.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/53165125015.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160727568d601f---darajomotabawal.pdfIn PDF document text
    • http://jarosi.hu/files/file/nanovadisujoxozunap.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/74998545829.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/96102375719.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/supijekowedowuba.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/doxaru.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f5afac509e98d18e155d7cbe66b0dc97/fugiren.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f508bdb72f0---pigubutona.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/muvedupetupug.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/36754749838.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/ralegobip.pdfIn PDF document text
    • http://szcftz.com/upload/nugupizapowewababimufo.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50820994319.pdfIn PDF document text
    • http://kustari.net/userfiles/file/24942872981.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/60395829547.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/dudejilisijezefefapobos.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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 11076 bytes
SHA-256: c27df72dad5e952f06348b7f98489d8a70d1e2e51f9a9ee53d45b3089c935414
font_02_sfnt_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 16720 bytes
SHA-256: 93755a5717f7333c1f542774db7b8848a56876ddc48ba556e6ec407c83bf128e

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