Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cabe8fdd2569386…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 04:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 795d44d95a95c41c5e513cafff2b679e SHA-1: a196ba5f562d2b821144d8c4c5d3b31f3912a564 SHA-256: 7cabe8fdd2569386c2a07d8dfe510b6809e71b5b1c3023fa8b47becfb996da37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress uploads and disposable hosting domains, likely serving as a lure for users seeking software downloads. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rgn2u.com/userfiles/files/55212296968.pdf
    • https://sunrise-photon.com/upfiles/editor/files/sadigurafasabinove.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f57d9921fba54af124e802e2a8ce3946/94896836049.pdf
    • https://harkakotony.hu/UserFiles/file/74155919808.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/61525351640.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af23a55eec---68146808592.pdf
    • http://etnorom.hu/pictures/meridepafas.pdf
    • http://candybeauty.vn/upload/files/temisujajanipogep.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430204643932786.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e0e5929fcf8d77f6edf443763ddc5594/49058359900.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609611b6ae84b---nunazidisomilugugarosof.pdf
    • http://goref.ru/files/file/rodifufesenubixaseju.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da18d42bac---galurenetukidobus.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/crm9s30q30jdlo7r4r05v5aqfk/860419594.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ms+office+2007+professional+free+download+full+version+with+product+key
    • 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_off0000e3e4.bin
2cbe221d11a717f504ccdfe57f210ed93a5609e54c363f391acc98f2a96f383d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 17052 bytes
font_01_sfnt_off00011096.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 16792 bytes
font_02_sfnt_off000128ad.bin
663c76c860f555b6a417e5412eb4512b3da7e9cd0514e65a44b54e0bcbeb9e51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 11460 bytes

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