Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cb31e79faa8ce8…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 15:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df32566fb30dabf1dffc086364cce1e7 SHA-1: c36a466c583d881a61e94bbe54c1ee2872055b5f SHA-256: 24cb31e79faa8ce80ba25b4321575900b678a593024f9b1594f19c6e7852f781
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself does not contain readable content, but the embedded URLs and heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac36a6e013d---24635183213.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a925606e2---masonilaferufuzedeboj.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98108b5f42---tebufowev.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/41849054664.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/79291217394.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jodojofikalosenerogob.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/36658499453.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/db22cb3210aba4b9352a315c09531c2b/30813184611.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/60282417272.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/regexufovaromadikuxovuki.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cc753891---febud.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/69c00dfcd07744f28bc8878ff754c91f/21918495777.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/93326463505.pdfIn PDF document text
    • https://auto826.com/uploads/files/11658806037.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/25063117842.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/tipalulur.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/fagitevuvopavebixegova.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d51fc828c---21795664401.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/51866980539.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/38055385216.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/18572551732.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/dodigasidi.pdfIn PDF document text
    • http://rubensova16.cz/files/file/tuzivotovewijumugo.pdfIn PDF document text
    • https://digireg.at/upload/12011622761.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83dc842d39---sivotelozogevivikesavugos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=workout+plan+for+muscle+gain+pdfPDF 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_off0000c3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C4 17588 bytes
SHA-256: 8c394d82e2e0191ee1234b50e8d5a8fb575c09c0b6e1d579b86031b81191d689
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 11148 bytes
SHA-256: aa3f3d36fdb06c8a30c19da5708e94fe5bf8848ae043b4ec85a5b6c3906bb8b4
font_02_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.