Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1afeced4f9dbda5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 14:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 880da598752150891ec585e092855fad SHA-1: bf9540960f8d0906c1f53be811a8b2f4a080cbb3 SHA-256: d1afeced4f9dbda5c2c828b6100af52ab202f92ca7bf422277eff5760cb35746
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites and hosting, suggesting it's part of a link farm or phishing campaign. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=silence+can+you+hear+it+movie+download PDF link annotation
    • http://ebbers-schilderwerken.nl/uploads/files/10693067234.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132745e700c1---18730591956.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/66616788111.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/24015079739.pdfIn PDF document text
    • https://12shio1.com/contents/files/97510058409.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/sadebapu.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090423501754.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a933adc47---kumobadaweji.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/50102502161.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/jimazawefo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613751045d65c---jilariderudajof.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/810890013.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/52316242183.pdfIn PDF document text
    • https://ms1oke.com/contents/files/gizepazonukofagezobemenuj.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/68557280590.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/23382782661.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/58992947882.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/61922366712.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/luvivupiguxoxurejajuri.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/41069348512.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/palivojexitezut.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/kowefazabafovena.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/78495884903.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/55824314499.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_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 10908 bytes
SHA-256: 18bf8135518e41e48c132b91c8582f81ea764111a800bec9e79f9498f156e4af
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 17976 bytes
SHA-256: 38338c4390ca0ec9ce86419580ffb796db1dec71e84234d93a78b230c2ef741b
font_02_sfnt_off00011de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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