Malicious PDF — malware analysis report

Static analysis result for SHA-256 747b8d31f6fd3762…

MALICIOUS

PDF

91.4 KB Created: 2021-08-21 14:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce4de98a5b304722685b0214e15ad598 SHA-1: 04f0a60647780538dde946814eb5cc885c17d43d SHA-256: 747b8d31f6fd376242a72ff4edf890674a240955ac9bb725cd48934810719a9b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, acting as a link farm. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=how+do+you+take+blood+pressure+with+a+wrist+monitor PDF link annotation
    • https://supermagnum-bg.com/ckfinder/userfiles/files/rukepegajalanitixil.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c8d1d4b7e---37482459206.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/tegora.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/92518389273.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc00c96fd3---16169985139.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c819609063---75633865139.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c7820bd8---zemozukipodutebujotaz.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf0848c05---wosalujasagijafaboxidad.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/doxuzukupalovoxobufotuded.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/r2cev4mv3gvn3tu9qldn6gmie5/menitorilotor.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/88080b56078203830b647cd334bbab5d/84619578952.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/jajadavibepeteda.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/da6d6d164e13a81d0731c13a823727bf/55870197259.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ed77423529c---vifurome.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d266a82e2---nuzutamixoges.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1159dfe5e---76011995564.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/diwupikekomumapilawevejo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076044f2fb4d.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75483bde9c---vadadinavisitaxabiwofetu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcaed0aa49---75441626182.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/88217091483.pdfIn PDF document text
    • https://basisnomor.com/contents//files/jolulurifinawu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0951debe89ca453389f26d4e4cb9de72/50684042766.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210714_8743A500CFCE243F.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/bedigevisalubekejos.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/xonak.pdfIn PDF document text
    • 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_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 11180 bytes
SHA-256: b05007533052a5761a32a648a7321bddf89a0c98f77cd03542a9b7ea727c4b4a
font_01_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 16976 bytes
SHA-256: 58baf4d8e5af7804408f5491e853770535fefe17f91ce1100f46879a357dc0d5
font_02_sfnt_off000146a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1