Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ec2b6b59e89d74…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 23:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcc508d943fe487d6e53ed2d412c8b97 SHA-1: 9f32c31ea7c96a1654de72854cbd722ed4eaba11 SHA-256: 35ec2b6b59e89d74028bc4c9d07ded6df334249c3fe166269e3557207751677a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cesiedizioni.com/userfiles/file/wibarigisovazifo.pdf In PDF document text
    • https://colakcivi.com/userfiles/file/60508313774.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/98119277691.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gataj.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/reseronutirugagefewuko.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/sesemonafipitexeva.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/melanagegisanur.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458ef3c3e36---bodizitalomi.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/93396133285.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/gezodoxuboxofiduraxoxud.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161375fdb0b08b---25312892186.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/86483870536.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/34649820876.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/39458286841.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/gapoxup.pdfIn PDF document text
    • http://gardatrans.com/content/Files/jubevedidip.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/88919840998.pdfIn PDF document text
    • http://farashimirooz.com/files/fexibikifetanud.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147620c569ee---42539184445.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1132bfc7980486c65f1eb2b046e080b7/tiwonofevovexarerunanita.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/xugoke.pdfIn PDF document text
    • http://leton.pl/userfiles/file/74600370913.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/23fbbba6549c01c1676f423500996a8c/warenuxulorola.pdfIn PDF document text
    • https://areicon.com/images/file/fofasikod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=live+football+tv+streaming+hd+mr+sports+apkPDF 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_off0000cf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 17716 bytes
SHA-256: 68dfc5428ef120dcb3289c8a7267c0a4efa1598f10374ab09782d81daaf1a5ff
font_02_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 11200 bytes
SHA-256: 7c8b2cb23fed7860861174d049d1db8efea7dcb05ca111f8e0a351a5b92cc97e