Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5125f2db45ef46…

MALICIOUS

PDF

74.5 KB Created: 2021-07-13 21:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86d79d66879396e92b9368c2b0888540 SHA-1: 8b4d16aaf877461d5d49629793bb467cd9f14d1e SHA-256: 7d5125f2db45ef46d93bc988a525f378fec77a77d8b4614dea4f92d3ae79d39b
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=pdf+export+page+as+image
    • http://tinavaron.com/ckfinder/userfiles/files/83717568380.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56c07c730cb563647e3fac2e4f053ebd/7879790873.pdf
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/renevikubulezogarisupo.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/27837455309.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3992084621986f5d11046083e4ed4e7c/xawukudufumegofafabo.pdf
    • http://al-bandak.com/userfiles/file/67322984043.pdf
    • http://usaoxin.com/userfiles/2021-5/file/sijuxedexujam.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rlu5c7k0qgqbhp74k5fj1u99ad/45148780781.pdf
    • http://mindentudor.hu/userfiles/file/5079467020.pdf
    • http://infinity-pro.ru/userfiles/file/83887084486.pdf
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/nezalaxasisov.pdf
    • http://bronia.org/userfiles/file/nipedonaxajozotuwodubodu.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/cfgsfs6a3r4iqu5n33c14bea94/zepakijer.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d1416c82---75707829351.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31869a5d1b---63099294620.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160759db894e7c---26364989630.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/htbcr3sltfms9c9rl4fr4bhea4/31331540906.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/14889163272.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e6d29e9c088da0fb015e9bdfc2ff93ae/xetojo.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5df7d8003---pusupir.pdf
    • https://atrax.hr/files/76967409125.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc206677c1---segowoxiridopojas.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/55361591746.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df51517da28---52323556726.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 16792 bytes
font_01_sfnt_off0000d8f7.bin
726f1aa3ea7bd4e77c0e057d627e6e191e40742a26770c3d1cd7117af984abbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 10796 bytes
font_02_sfnt_off0000f1b3.bin
9a4c90d6bdc4d26987674edd506d932ec6a68f26fa9dfc6eab3584d752f1d6d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 16688 bytes