Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a85c2593c95683…

MALICIOUS

PDF

78.8 KB Created: 2021-07-13 13:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2432d3ee75018ea395a9773b75f5bc97 SHA-1: f97a237b043a820c931f1ca74bae1836ffffc9e2 SHA-256: 37a85c2593c9568347f33e1c6a22f6a9968e06ac046cf41fce93e4fbc4d28c8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082533b8e7aa---56254157556.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b7ec14f54---98322459457.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/abc628ed52ba8019f355f4c570fa7881/63084188248.pdf
    • http://buddhavehicle.com/userfiles/file/10978801070.pdf
    • http://bukharasuwanee.com/sites/default/files/file/66469010211.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/zasevogiweruxigav.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d24c54c0520---dibada.pdf
    • http://www.yoko-ono.be/images/userfiles/file/89517294469.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7eab759b6729f2ac88380082254a2908/87466713310.pdf
    • http://sage-chem.com/image/files/20210620_171519.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef673e5ac0---23178654856.pdf
    • http://metall-press.ru/files/kitugazasutipijet.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/4e8d7eb3cf6c2956e6cf7a1602d3f316/difefonijameli.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/53630102273.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/kigim.pdf
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/gifeziros.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a6a13a91---88135134988.pdf
    • http://canoeing.by/pics/files/20237220010.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082efa172ab0---votedusugik.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/51734077272.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482219edb5---27119817666.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff3f41a67---75842548246.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c06990f393fd467e740c9ae17949638b/13876456563.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ed6de11b5816c6fd242f6ec3f9738c77/84223026178.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/91554175f98a57a4b0aad3b8b2ab4f2b/33324300343.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=common+nouns+that+start+with+q
    • 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_off0000d21f.bin
12feb5d0c4896584cdb7079c39ecf8fae5eab177722cd5be041cc6e1ab4487d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 16852 bytes
font_01_sfnt_off0000fdc9.bin
5f2cd96d477485a2823d8157767fb70acd0312d535af7fe9bb163f3ff5df2702
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 10556 bytes
font_02_sfnt_off000115c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 16792 bytes