Malicious PDF — malware analysis report

Static analysis result for SHA-256 906cf3493cd80cc3…

MALICIOUS

PDF

80.4 KB Created: 2021-10-08 03:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a46c3783463bdd03cba6073233c9e526 SHA-1: 3e8269afb377ad94ac8a66e1358650bb6d928db9 SHA-256: 906cf3493cd80cc3d48669a1044c688c968bb9a633b3f3261f5e8461109b77e5
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting and compromised CMS upload directories indicates an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://primethailand.com/ckfinder/userfiles/files/najoru.pdf In PDF document text
    • http://sllight.ru/design/img/upload/file/bupuzojagi.pdfIn PDF document text
    • http://refmexgl.com/web/uploads/assets/userfiles/file/61291026897.pdfIn PDF document text
    • https://agatanorek.com/files/file/4341123521.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/15820240367.pdfIn PDF document text
    • http://sungder.com/upload/4509312500.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/44352855124.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/97682518528.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d3ab058b11d86c6f056761d8bee5c107/vemakoxezij.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/94176949416.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/54732775526.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/lunoporitu.pdfIn PDF document text
    • http://peoplefoster.com/pliki/metut.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e333e648b---xiwofojezorokabap.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615a31df5aca2---86713993229.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/45308725257.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/59926062710.pdfIn PDF document text
    • https://kawanmto.com/contents/files/17803148645.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/pewupiruritovulavikib.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/89873028885.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tijedaxafasimudek.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/5457698903.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/19750058378.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/pomudizawiz.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/00d16ae0ac1da9b89b3c8d0a76e1bd34/zuwepigubaderubugofal.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/55842144550.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/90785124697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=important+elements+of+democracyPDF 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_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 19700 bytes
SHA-256: 737140260ac25bce2374080fe5cc995bef3497bef6990922ad169d1a89fe9512
font_01_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 10752 bytes
SHA-256: 586f985ed3950e35082b6570f6003c62496c21cb081ca0980049d9930b6debf3