Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6636476ee017b3c…

MALICIOUS

PDF

99.1 KB Created: 2021-08-06 13:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a0242616d0a357bf78437f906ae39b2 SHA-1: 47b076bdcb4b5b0161b0375fec37af8a2a62252a SHA-256: c6636476ee017b3c3e7c318f189e94a29fd9bae2a0e813016b0ece7323a2c41d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pixomot.ru/uplcv?utm_term=what+are+4+types+of+ecosystem+service+examples PDF link annotation
    • https://ebooksweb.net/files/file/14743519268.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/33893888406.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/804aa237c5f2bdb62638b9ef03f5abe8/84828144743.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a578d2bcc106d8fc86af838076901f4b/54307556162.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/6808195b70d8262ceef555354916b580/88534164275.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/linopisapux.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/kq0l6oafkemt0p6ccbg6s3uail/49195588070.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/tifabelenexewojegomapexa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4151b6a08a0a6eea4cb2292454eaa671/tivonejeromiminujuvuz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/89f86447b83729f80f3f8463a12d19ff/mirewaxapafojulenafolazug.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104fc9792838---jifunenomemisazaka.pdfIn PDF document text
    • https://alohasafaris.com/files/81026845109.pdfIn PDF document text
    • http://farmina.ru/uploads/files/77533012338.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/konivopularuniro.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/linasuzuni.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/rogerawavopizuvawe.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///wafitabimalepu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fa85d939---lobuxabadugomenovur.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/kagutepusekudijusonogir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2fa54d80a---boridesukizorivokajovu.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/tonawodorexuta.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/vilotowizolen.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_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 18340 bytes
SHA-256: ff8e11ba33980a9314f78729f5b4d2b3c2a2bac512b45e4c331ada33b68fdd3c
font_01_sfnt_off00014c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C19 10996 bytes
SHA-256: 131280a95a40d951423e938d42eecf91210ff1d0ebcfa674c726eb143d394805
font_02_sfnt_off000165c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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