Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f351192df6f084…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 06:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7e6f72549845a640d73310cb584e0a7 SHA-1: 6fd7f6e694b9392fae901a1fc463f5b3a2cd0a38 SHA-256: b5f351192df6f08418fa1cdd9dd48186942c9e24ba90c3a2db3ef5f681edba69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farm heuristics suggests the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=amazonbasics+6+sheet+paper+shredder+manual
    • http://sdds.be/userfiles/file/98527555955.pdf
    • https://gikguamerica.com/userfiles/file/33963612192.pdf
    • http://avonsteel.com/UserFiles/file/98157932351.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/zikufixonagolemixanasexuj.pdf
    • http://www.anclupnapoli.it/userfiles/file/xumedam.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/bf3fcfeef548bc26a8428aa5253762eb/24040095046.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a01b8a0d---rogadodonebotevexidumo.pdf
    • http://mamnonlittlesun.com/upload/files/zubowi.pdf
    • http://logo4you.dk/userfiles/file/13048606691.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844e395609e---85908087843.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d5c4b4542df8fadc10d6d76fe85fd74a/19795328504.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/92798368643.pdf
    • http://stavebnevyrobky.sk/www/upload/files/zivare.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608475a0e8dce---lifunomejajol.pdf
    • http://alrabbancapital.com/file/files/moruwonofikufizixavuja.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b2ba0f78cd80a475cc70843b50ec058e/73812741348.pdf
    • http://5percent-design-action.com/upload/users/files/44159936301.pdf
    • http://abnig.friendship-match.com/upload/files/silabadipig.pdf
    • http://stalmost.pl/userfiles/file/76786673494.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/xarigobutufigimane.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f785ac735d783e0ee4d18d20920a38e2/86396100147.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608091efcb217---dogigezerewuzomixadari.pdf
    • http://izdo.org/img/userfiles/files/nutorivatisopazakus.pdf
    • http://danieldesignpro.com/userfiles/2479423169.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_off0000c309.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 16792 bytes
font_01_sfnt_off0000db20.bin
e5f72512ee637ce74a991c1b49f2df6b311fbd6ea3cc9dc6871d197b1ebade43
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 11228 bytes
font_02_sfnt_off0000f512.bin
bbc7acfdbb9a50c640560bba68589b9166b1264e565e98ffff42deaa95f1bd4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 16324 bytes