Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7347fe00dfb71e8…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 23:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 432dd9d8ccefd5bca011ab5ee44c7042 SHA-1: 7e1d2388a3aaf996ed90d911428a74d8edbc78cb SHA-256: c7347fe00dfb71e8783d0b7fcab7976b31f31e4fafbf747d935f7548b251fac7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS upload storage, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://hotnews.md/upload/userfiles/files/24434571001.pdf
    • http://qfuse.it/images/uploaded_files/ckfinder/files/1631432250_7bd353a758.pdf
    • http://bestbuyfromindia.com/userfiles/file/72434937379.pdf
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/jerolifedikobopogatozag.pdf
    • http://yuilchem.com/userData/board/file/koselinewisavivuges.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/50757c60ead6fa968ab463a3705ea07f/genaloruzewukomoxusuje.pdf
    • http://stjconsulting.it/userfiles/files/36040044462.pdf
    • https://alatheir.com/atheirwsfiles/file/80374803379.pdf
    • https://extremedriveline.com/ckfinder/userfiles/files/18782095071.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/mareje.pdf
    • http://henanshuangxin.com/d/files/kadagujutazibojamepuxoxat.pdf
    • https://wanna-drive.nl/files/File/65947635170.pdf
    • http://yh-nutri.com/filespath/files/20210918085102.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161366dff6d2b5---waderadalate.pdf
    • http://www.de.ruben.pl/ckfinder/userfiles/files/1142275932.pdf
    • https://univerosg.com/ckfinder/userfiles/files/98372472496.pdf
    • http://photopuzzle.net/userData/board/file/66052062961.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f5edf8b0dd422b3b6dbe2fbe1f01b219/paziporopekim.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/rizimumup.pdf
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/linukuzujev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=salamander+beyblade+code
    • 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_off0000bb09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB09 16792 bytes
font_01_sfnt_off0000d31b.bin
424b2d964b2c7fe80405e9c9fe4a508b9576b6183a1b73c0b1b8330bee8f0da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 19316 bytes
font_02_sfnt_off000105e5.bin
8e7ea6d4edf04a1c72765b2cabd9dc03e9ec2379d639755f4baa9dd9cc32e3d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 10504 bytes

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