Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb30e94b10bb66e…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 15:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfdbf0b3f054eadb77d4abea7d28ba18 SHA-1: d8bde5bcdad7838b8f8b2404dba3428b4c06268b SHA-256: 3eb30e94b10bb66e036c0a267b4c6cdd267b0e3688ccdd6974af81e438368551
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=tcp+end+to+end
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f3e3ba56775110d7f74a7a77af09fe01/dojozitoxadirejedobigeja.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e6d4b83f---85592280062.pdf
    • http://gloucesterclassof81.com/clients/23558/File/80329493976.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e9dd04a99---pozoguvovoravuxudok.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5r578vlg98ptc0ss8d03krk60t/fusuxu.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28cd17dcb911c029f307cb89d937881d/keduseneverew.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/dc8refmv1c723adv1abbp137td/82216219075.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1ef24101cba092f6c05f8bbc20fb25af/vugawinukapigetof.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d169de5cfc---88896822096.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e776f9182194223a48d23ab2631af24d/45308947234.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2025b83302f351e752a47c4098548f53/18495024171.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/a2fsvpi8hg5kto125pin7ea9mb/budamovosirutu.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/wezilomowa.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce0a4d8fc---wakidexe.pdf
    • http://www.anclupnapoli.it/userfiles/file/lafebukaxuxos.pdf
    • http://stark-tools.ru/images/uploaded/3189746393.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/719136313.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122c76a065---bajasagemumow.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/61fdbba8fe36d9e0753b7236333fcae4/watijowexajitumigixofutav.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_off0000e015.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 16792 bytes
font_01_sfnt_off0000f82b.bin
502635299f2a9bdf921ac5e9f5deed93a7df0f56d510b7a2b607066ed090fb63
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 9904 bytes
font_02_sfnt_off00010e1e.bin
53eb5f04f9f5419f765411adda1b6987c3ad89c4c13bfffef6ca529d372906d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 19576 bytes