Malicious PDF — malware analysis report

Static analysis result for SHA-256 3426ecd11e868edd…

MALICIOUS

PDF

94.6 KB Created: 2021-06-29 14:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7b7e565e993b3d3fceff0038cc13f6e SHA-1: 53d4c97819631640c47f199858cf23da5fe6ddf5 SHA-256: 3426ecd11e868edd700989340b9a00d022870fa0c182794d77c64d3ba3d1ca17
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on potentially compromised sites suggests an attempt to leverage these sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098c87dbdb3c---17790824954.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mf7fvucbi4i22psbk578op8777/32337922844.pdf
    • https://holocaustresearch.pl/nowy/photo/file/feregejajaja.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21c5c2dfb6---melemogujixizux.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9448a419dff04b6420dde54690f440b7/fonozapuweropizaburox.pdf
    • http://smartwealthhk.com/userfiles/30123066826.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3f38a593---71870594654.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/lurawuzibopemikigixude.pdf
    • http://phutungvespaco.com/luutru/files/dafetidoxapawetagofigux.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/aaf579d1656c73a7548610c6bbbf2264/mifulixupiborax.pdf
    • http://wallsfamily1912.com/clients/876683/File/78570483160.pdf
    • https://ipic.vn/userfiles/file/bexoxoj.pdf
    • https://larioenergy.net/uploads/file/jikurimo.pdf
    • http://charivne.info/images/file/sitirapewuso.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f2e327e6ad7f25db5d543f90b91aebeb/kevusiwopaw.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7d838e98d3ab5d92ad46fcacf99aa304/rupadulunanuketowus.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/bbt6kjn80l753k7tldqelbqecm/dopikitirowirazusimorim.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f1ce8af9784a27f005667b6f25a0a258/zojunejanegewab.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a768a27143c---sumereluvemajilul.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/34293042903.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2273a94b49693deeeb864fface38b097/lepozixadoxuvedamide.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077673f7040f---vuribemaniki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+hand+in+the+sand+osrs
    • 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_off00011078.bin
88cd3cddb948077408bd244d345eb7e8ce2ccbd9abfd7ae4841bc8f6fde310e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 10280 bytes
font_01_sfnt_off00012790.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 16792 bytes
font_02_sfnt_off00013fa2.bin
a9498b96f04a9357f501bf3b5d24121ac7ff00ced78983eece572d92d714fd82
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA2 17676 bytes