Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c7b416befe361b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 09:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc53594653cf907ed90b261064ac771f SHA-1: 2458402a0ac729a441db27a06157de92d98d75e9 SHA-256: 61c7b416befe361b0d3439944895cfabf12d8ce0f17c472ada8eda32c9048c9a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on what appear to be compromised or disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous URLs point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=slow+motion+video+fx+apk+download
    • https://hinodecoder.com/userfiles/file/49869408273.pdf
    • https://nevjegyzek.eu/uploads/file/peworelekemufiweko.pdf
    • http://erodiertechnik-wenzel.de/userfiles/file/rakedu.pdf
    • https://pensionradvanice.cz/res/file/pefataze.pdf
    • http://chataphan.com/file_media/file_image/file/94253942134.pdf
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/lowefuximomoniwimol.pdf
    • http://autosoftware.company/autoresponders_images/files/zogobadosasololabutawipek.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/fosezesitibizakum.pdf
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/45036148012.pdf
    • http://tunglamgarden.com/images/fck/file/58264428905.pdf
    • http://absolutelyneon.com/userfiles/file/78481266386.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c22b6975cdaa20553b01ffda82f62954/44297003883.pdf
    • http://madang.eu/f_pds/fck/file/nefojetujoxokepupuvobo.pdf
    • http://gonganmi.com/userfiles/file/93706851622.pdf
    • http://techscreening.com/userfiles/files/9521613197.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a9e24c9a475d9c0f6c80e77b2417e3de/37330038337.pdf
    • http://www.allatpatikapecs.hu/images/file/72054573895.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210913_FDA576791F5E0276.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/rudiwe.pdf
    • http://fcgo.tw/uploadpic/files/19609998132.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d824c227---viponu.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_off0000d7b8.bin
f283c232f1d1384a95556e4b4edc08e79d619e1415153f751ad3c8dedd33dda4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 17872 bytes
font_01_sfnt_off000105f9.bin
589238d555b037a689f8e486cdf284d4d855f3295f3f1e9f14ed9d6bf815a01c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 10812 bytes
font_02_sfnt_off00011eff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 16792 bytes

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