Malicious PDF — malware analysis report

Static analysis result for SHA-256 13baa512a08e7f79…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 19:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c228b157c8745cbd9413264bf40371e SHA-1: 3c45ddf1461f1d54450b2203edebbff27103084d SHA-256: 13baa512a08e7f792e14de10bf0a04b8414a413d032fa190d6df2e92dd3530aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS upload directories. The PDF structure and embedded links suggest an attempt to lure users to external sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF's nature strongly implies a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2818

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c26d97b6f---refupukidujumazi.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/58598538184.pdf
    • https://stomatoloska-ordinacija-rijeka.com/files/53700463669.pdf
    • http://sevvalturizm.com/rsm/files/xivasokiwe.pdf
    • https://west-holding.com/userfiles/file/7411581868.pdf
    • http://jkbprivateiti.com/userfiles/file/77183105123.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/xomodabikofagojaw.pdf
    • https://hnhaa.com/userfiles/tnejp/files/99629385491.pdf
    • http://thepokeluau.com/uploads/files/13721304959.pdf
    • http://hkxhjfc.ltd/uploads/files/20210916065501.pdf
    • http://www.huescalamagiaenfotos.com/userfiles/files/59854312368.pdf
    • http://muszempilla.com/files/file/pivojojipaborutavesu.pdf
    • http://ilovechardonnayhills.com/userimages/fatitap.pdf
    • https://livewireeventz.com/userfiles/file/59006316054.pdf
    • https://chennothinterios.com/uploads/file/10374591422.pdf
    • http://vodova51-53.cz/files/balixomosumomimev.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce5665d8c---wikasivonipomedumewixoji.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f74c3683a---24162859705.pdf
    • http://stilistspb.online/public/files/uploads/files/86544348684.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1ec93fe9---juwotonamaxujawu.pdf
    • http://poexali.org/static/image/_u/system/files/voxitita.pdf
    • http://ptichile.cl/userfiles/file/49373106512.pdf
    • https://bosgo.mn/uploads/files/26512716203.pdf
    • http://www.tokyomagic.jp/images/library/File/86710520496.pdf
    • https://awinresource.com/uploadfile/file/80165775907.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=english+guru+book+pdf
    • 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_off0000c803.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC803 16792 bytes
font_01_sfnt_off0000e015.bin
ffe9e4e88a3439c68dc7783dbc668e6aacac3e6143784b659241304bd37bf886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 17720 bytes
font_02_sfnt_off00010dbe.bin
2dae6c25559306e17249c2949d9edec8dea01927bb105920e898595f8e17709e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 10700 bytes

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