Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d828f71a260c9b4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 18:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 736c9e23c419a253da9fe56bd34788d0 SHA-1: d7faf376f4a1d725dada1f656fa0f0270ac85e34 SHA-256: 9d828f71a260c9b4598ce038599b1e4ee0e28f4ca352731b72c30f095f95b47e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the detection by security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=watch+bajirao+mastani+full+movie+free+online PDF link annotation
    • https://adasms.fr/userfiles/file/8777293304.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2275dab6c---tedububaluwovux.pdfIn PDF document text
    • https://securitydm.net/slicice/file/63075477852.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/27005550099.pdfIn PDF document text
    • http://pactolous.hu/upload/file/93193346102.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903055751.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/83355663353.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0f12447f---48319989504.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/terasebanumejarazuw.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gogofuw.pdfIn PDF document text
    • http://planbmedia.hu/files/dixolijezepuril.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v1rn5aqa0nscmbclcbls718fau/40744716241.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a45d4fb69f761172813fb32e3edcbe88/wazexiro.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/kaninepofaso.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/tomuqqe2qrihao2dibgop4qqge/dofoso.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/11342408332.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/lidatifitobafaxujobutesag.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/dumiku.pdfIn PDF document text
    • https://digicpictures.com/downloads/86362464812.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/36074800453.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/75732123857.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/samegepuzasuzemu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/zumigis.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210917/16318507545915.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/52489530598.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_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 17424 bytes
SHA-256: 61bd06d5a690abbd1629c5de1824065c04b88f804c535fecc6210736262642c4
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 11032 bytes
SHA-256: 188a6019a2b8b850e26fc54b76c35d9af633c5b002a605d9a42f297e39b71245