Malicious PDF — malware analysis report

Static analysis result for SHA-256 7702558a55eb55ca…

MALICIOUS

PDF

99.7 KB Created: 2021-06-28 18:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c3ef0990fbff291d808b6310a847d22 SHA-1: 848361b7ca17fa33139924b645f96d0676d6ee73 SHA-256: 7702558a55eb55ca7595054047c2b04a0961f388ff04d89d1c0cf730079fad75
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bayernglobal.de/userVZ//file/kanunezezojabopilitumad.pdf
    • https://cvsc.co/userfiles/file/tawutuputunivoziforiwow.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9316a50e329ebdbc08b4592a140768e9/wabuxokatatoritowogef.pdf
    • http://maciejabramowicz.pl/upload/files/file/zovadi.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36cee5313a---wusosop.pdf
    • http://www.saito-ken.jp/userdata/file/rebexugazavoguv.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c9d94465---36519774377.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a002cc499073d83cd9b2d6dd17ea229c/tewepedumo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/13075d18f15743373afad24fe6cd19e9/82925167155.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/sbisdig8hejtucenbiq3o8t91i/86385115923.pdf
    • https://szabobuszrendeles.hu/files/files/watagejuwatewi.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c37fc489d---40624809457.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988251c22fd---mejika.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6c1009c9---70983640799.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710a146cb10---86983175416.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b46c131c1809573698b630701fd258df/dimevadejixinu.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/31eef9f411816df20847d55127ea6e05/gidowafapuje.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16073106a470bf---juxarot.pdf
    • https://dollarplus98.com/images/upload/files/81435384924.pdf
    • https://aimara-bg.com/userfiles/file/silevovorogida.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/fb1c632ff146f4a44b4c5743ef4365be/kovakodalibi.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146ec5bcee---xepujixikivasepuwux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=past+present+and+future+words
    • 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_off00012340.bin
008cd3e6fcb455fc66af6692b1d2b38bb8f6d4551ad2738b0b54e6db6faf3e31
pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 10540 bytes
font_01_sfnt_off00013b85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B85 16792 bytes
font_02_sfnt_off00015397.bin
143136dc9e4e5ee80cbd3a828c4c30341fd6276e61732005baf6e3439014eaca
pdf-font-stream PDF embedded font (sfnt) at offset 0x15397 17064 bytes