Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a4a6e05794fb6b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 10:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 770ea45bcf8d8eaeea272501f99bdc2f SHA-1: b5cce9c3f0f6b8c901a7df72b30d7abc34ab59c8 SHA-256: b1a4a6e05794fb6b9fd445d57b386fba14be7e335dc5fe6f2592edc9caa72ee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the overall detection indicate a phishing or malware distribution attempt.

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 https://drafthe.ru/uplcv?utm_term=remove+apps+from+firestick
    • http://preciz.com/uploads/wysiwyg/files/kutezalulilafibam.pdf
    • http://brixtontaxi.com/survey/userfiles/files/tujatuwuvurix.pdf
    • http://iviltra.lt/images/files/zalobem.pdf
    • http://patrickstaxi.fr/userfiles/file/77307424393.pdf
    • http://graciaindoutama.com/kingkong/userfiles/files/74641766115.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac9517e787---27902292694.pdf
    • http://picassogift.com/Uploadfiles/files/28192817747.pdf
    • http://zeci.nl/im/image/vasiwilizagov.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fb0c05fd5d69862ee87f20dff790f5bf/tivewekesixunasif.pdf
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/tujogevusikuwiwijafad.pdf
    • http://casavacanzesanvito.eu/userfiles/files/zodufumujobujovalomodu.pdf
    • http://sun-green.be/ckfinder/userfiles/files/7620577833.pdf
    • http://spokoino.ru/i/upload/files/76550020677.pdf
    • http://lumieye.com/userData/ebizro_board/file/sokejenexidozarak.pdf
    • https://maggievanostrand.com/uploads/media/file/fowosusomipu.pdf
    • http://qamsar.org/userfiles/files/geverivobeniluwe.pdf
    • http://rpsbchamber.org/editorData/file/lisizavoxivilojisigel.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161413c82eee73---17293702440.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/dezuma.pdf
    • https://forumsevens.com/images/file/raxipisugapudevi.pdf
    • http://sheilahancock.net/blogfck/file/48604536942.pdf
    • http://hopkim.vn/upload/files/gumoxamopa.pdf
    • https://tradingphrases.net/userfiles/files/xasexudaraz.pdf
    • https://clearpatth.com/userfiles/file/nedufetifuxafopugifej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad0.bin
4b6f322d7576165876d3f68c792beab384dc03735931b74d1e3852ea3ecefc1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 18248 bytes
font_01_sfnt_off000109a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 16792 bytes
font_02_sfnt_off000121bc.bin
95c1ef7fa64e0a5b988e13de77a14fe5a673171c4073975c2c49fe519aa207f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 10696 bytes

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