Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e565d34df7b2f08…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 01:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8214ab496df005100a35b9995f474b56 SHA-1: 9b05d0d9815e5c80016ad25e8aedf96dd8dfd719 SHA-256: 5e565d34df7b2f085d1cf63962cbaecfc1a46496aa924a43c895b004ca587365
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ferrocom-spb.ru/userfiles/files/78813542511.pdf In PDF document text
    • http://dansensvenner.dk/imagesfile///tegadixi.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/zezezamo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f1e06fd4---jimabuvosoligidebenuw.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/79291217394.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/wapovakifanevexigarexige.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/19360651886.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/kenofebuduxamakaxifuwoko.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5aec4f38ed56a3ef9ad48d74b7bcb366/vemasatewefa.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9h5lqms2p42rmvdh6j387kqf52/sagovofovanolezexo.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/58281126255.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/lokizujudamawezekobe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mikedijobibilirexopofivo.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/vimusekojikozijeb.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/00d8bfb77fcb7faaddc5ae2ff8b80ff6/budubamajafejatufewufade.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/kolobabisaxevu.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/70502491050.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/80118764624.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/wupenug.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/10374519553.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16129e9d6d502c---74012495672.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/babf88e7b0c863e46e13c6c6298374c3/18577041796.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/77792789626.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/mulevigagupurugirutulix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=amortissement+du+capital+pdfPDF 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_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 18276 bytes
SHA-256: bed6d60df0c4eb3872d09f663645c06dc03a0466d7cb9d7a704ddc4b9e73e559
font_01_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 10864 bytes
SHA-256: 9fe1adae9422989a3ab03b0005710d6945ce131b0760b304be885a341ca55c92

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