Malicious PDF — malware analysis report

Static analysis result for SHA-256 81614a914c879eda…

MALICIOUS

PDF

82.4 KB Created: 2021-06-25 21:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7d068d762772b77793f85ca1bf9aa7c SHA-1: 6ba73cfad7d692f4da3b08d784128d4187351177 SHA-256: 81614a914c879eda84898ce49a81bfa613666de58fbaefd859d972495261de2a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the URLs suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/f1f1ioe39pgndm3pfeljn2atf4/morularenemetevibikula.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ee6f2e415afcf40b61907028b529ec0c/62481612561.pdf
    • https://kede.org/userfiles/file/rosuki.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb9180edda---kivinotituwuvosagi.pdf
    • http://gloria-eurex.com/91149145338.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080583a8a43b---56024123200.pdf
    • http://www.biotanika.pl/upload/file/risibuxoki.pdf
    • http://cleangroupbd.com/ck/upload/files/logiwelopewamu.pdf
    • http://branpc.in/ckfinder/userfiles/files/30233618414.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c509cb71---40233435465.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/43570563538.pdf
    • http://ruresept.ru/files/file/20278231226.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6115e3854---30537712791.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ae5e9659a085804feeb2a05f80e51da2/soxazaj.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a467348c53a---77679870914.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a613cec982eeaff7bb76c342f67e775b/zobujasapunisagiponoxaxow.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ebaac0577---36500238375.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/42631440557.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a14d1528b---78675785315.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e8e810976067905d43246afcf270d979/lamavuwimilunepen.pdf
    • https://egokituz.eus/files/galeria/files/petavopusex.pdf
    • https://nestaerospace.com/uploads/file/xikuvoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=examples+of+soft+x+rays
    • 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_off0000e2de.bin
b68418d8bde03188027d734ca57dc2ef0dd22df81fc69a79e7072f4ce9105915
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 16156 bytes
font_01_sfnt_off00010c92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 16792 bytes
font_02_sfnt_off000124a9.bin
d4238f75c3a8b3dc626cf898115f95e0e24ae0ac9f823c507614e4fef2bbb172
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 10520 bytes