Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e67b4c43b35b04…

MALICIOUS

PDF

77.9 KB Created: 2021-08-10 20:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 348201f23bdbf212effd124b7dc8ca97 SHA-1: 26c5b5f9361553bf5409f8a086f2d2827dfdbc8e SHA-256: 68e67b4c43b35b04e73d61ff35809c5253aa955dd9263a42d87957f8e1ab95c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204c3c1354---ratoxexubuzufi.pdf In PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/oe6cjpqvjlvujp6e2t8sc0a0m6/ridowizuwilopujudari.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eae78e5b0---55032637626.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/kupojaxefogepu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094764756ef5---51099302267.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/32461b1fbccaf8cb44949392786ab829/68609860901.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/93957977832.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/solizazosubugoduderin.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7jehjlv6l9hjociip0luqkek34/816762143.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ec9a0e9a---dabokabafiwij.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/sakug.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a2c3e5f00ee9422fbf702f9af9bb6075/68965651316.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/fa51d5cffe0bbfdfd2857255c8418779/65297553142.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/98095866931.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pstsmpvjqc0uqbdsppfgm453b5/xipuz.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/delubu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34c8691aa---kijopeputoxurizobera.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdc885a041---32977216322.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pgun51gs39k3jv6g7565qvq26k/vujaw.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gaparolorekamelimo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xagupelora.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/javozanaxudoroparaveta.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/furipetaxelomadikagi.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/95402970171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=organic+chemistry+janice+smith+6th+edition+solutions+manual+pdf+freePDF link annotation
    • 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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 11604 bytes
SHA-256: 008fea1cbab08a1e7f96ad58e742b0dc7d8e2f62c4e49353cf552cfa08db8a3d
font_01_sfnt_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 16388 bytes
SHA-256: 3aab53cea3ad95fac998cd037c841a1902cbd57a1bcfd452422c3004a4d4bb96