Malicious PDF — malware analysis report

Static analysis result for SHA-256 becec747a153a087…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 09:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d9cd169614b801e92f1b034dc635b11 SHA-1: dced34c40a7c9479d808da82679c7cc7c83c6b33 SHA-256: becec747a153a087a0a035e30365f1b649ba61db6f21f374bfc1250b652f14c0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a pattern of hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://atpl.aero/ckfinder/userfiles/files/30332794903.pdf In PDF document text
    • https://soudurelauziere.com/upload/editor/file/94292693709.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0590a2d43---23519079086.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c413fa30374---19562471157.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/lphvsd2tdor8589j844j7jve73/kanifamebenavomuw.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/xotogevapakisadepatozed.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/o8qetfg312vdm6r8tb3qf7keqk/posawabubeloxajaxo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/686f7ngses5ipegsarpv4slk5c/vunawilevimirotilivug.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/81671867373.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/36053648647.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c500a86af8---70651840803.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/29141067594.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ede0f7d31a57e21b13083fdfd074e2b4/11246658770.pdfIn PDF document text
    • https://topupdana.com/contents//files/65252483464.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/zifonesonizaninupipofuxa.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210829_2161B042C16C4136.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/dedupimuloxiroxanokoruxa.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/vadob.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d9a38fdf9---39038584238.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/79698a4dbf23b7312903d5627f349eb4/divufikegibelad.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/70179311038.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b32fa78b215---45570388403.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/vowig.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/71148126997.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/19950239300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hollywood+dual+audio+mkv+movie+downloadPDF 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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 17880 bytes
SHA-256: 1f3586a7fd0b00697e28a5ec013dda2b197bd0c44eb6a315ae369be081bc9743
font_02_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 10492 bytes
SHA-256: 7976169e69fbc251ab03f2988ee5f08622b2b18d50bbe2f391297be7cc33fb59