Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c3785076d07c16…

MALICIOUS

PDF

81.0 KB Created: 2021-06-30 17:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df5217bc83dbed5231000704d259a25b SHA-1: 7d332df43b93e34bfda84df254fc9a117ad919d1 SHA-256: 73c3785076d07c160b586a2bd2e614b5bba38fd5669407aa83bdf04e39c8f3ee
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of many external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://a2itsolutions.com/chop/multimedia/userfiles/file/nekuwibe.pdf
    • http://stellamaris.cz/userfiles/foxutol.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/uma1c5bl2bucuc3vsq7l5hu4a1/82162947483.pdf
    • http://kodcomputers.ro/2664/uploads/wasodubasotukaruvenegite.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175b2123c8---52960125665.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/kowuzepakagudobil.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/71bb0b5da530c5f51c06bc229c2e169d/benomafazanozomowot.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/lotoxupexiti.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/su2ksop0jtpvv6u2ogoapm2qvj/bunawexeriresufir.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b03dbd2d011---67852460395.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c77ca309225---30098346605.pdf
    • http://cayxaotamphan.net/userfiles/image/file/98103291498.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/740967778b4c79c601f9e37a6fd99bd6/73745423813.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3967d51a---69295133873.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a48fe23b85e---27392169122.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/f58c3d594239f716adc50cc5867295b1/96299459189.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609b978ec0f04---23593012147.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7eb3f1a1d0b1852d406a633fe3af88fd/53111481796.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/39f28657679310385df75faa1fa81174/67900978067.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d4e3f7b4---98859225298.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/xokefa.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/tuvokozosu.pdf
    • http://vswet.ru/f/34361675403.pdf
    • http://bocghedanang.com/media/ftp/file/tusiwikezopekibulew.pdf
    • http://theclubburger.com/uploads/files/togek.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7c8f7374b1b17788a6c78ba9b7dded6e/78540766816.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=4pix+one+word+answers
    • 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_off0000daa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 16792 bytes
font_01_sfnt_off0000f2b7.bin
98547efaebff33bebad5a686031e7f23b2866ae096b53f6bd8aa5c11c743574a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 17024 bytes
font_02_sfnt_off00011f10.bin
64165abe6ea9179396b22732f27b382b67d0ca148546432450a2aa2026e5fbce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F10 10412 bytes