Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4a23c27136a80f…

MALICIOUS

PDF

72.2 KB Created: 2021-07-04 01:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 985d32277d50ff6e50ac5839042c451b SHA-1: 2769d79f03d3c09596765657a434e974142ff335 SHA-256: fa4a23c27136a80f841811587cf2905a70df6c1093ff4ef30c1f89733b13107e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://miaousland.fr/ckfinder/userfiles/files/21446868419.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909cfa767e0---fuzexevakupux.pdf
    • http://chronicles.ae/userfiles/files/90541190657.pdf
    • https://chmelo.hu/sites/default/files/file/32209276235.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecaed151d---41419519499.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/42jrst4n72kaci50e14i07mel7/11188958996.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c603e004cc7---55385528787.pdf
    • https://alirezamirmohammadi.com/images/upload/files/letekopuvanalifeterif.pdf
    • http://kingalbertltd.com/uploadedfiles/file/45115846082.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/fasumokokiwibe.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/27de33810f91c85f3cff89eba34296cc/78492359703.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a78f962e6cd0494a15701eba08ec0a91/watomuxi.pdf
    • https://dodatnagarancija.com/userfiles/file/saregasisijekemimi.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f61fec4e0---jugejexazotobafodu.pdf
    • http://dailycan.com/userfiles/files/55925712849.pdf
    • https://mama-light.net/business_school/uploads/file/96602209980.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9a2ccf1cdae5754812be9d983d723cde/gixaxaz.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd25384d9c---fitanimitesevavowifokawa.pdf
    • http://dolphinkorea.com/files/files/vawinibu.pdf
    • http://tuzvedo.hu/elemek/file/vamojunisunejeg.pdf
    • https://accuratesearch.com/userfiles/file/28477502678.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=look+to+means
    • 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_off0000bc89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC89 16792 bytes
font_01_sfnt_off0000d49b.bin
8e2b8ddfd042ef70fe4b3b9598e4b971154f2a6b9acf31bf19aae6d77e47f5a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 16128 bytes
font_02_sfnt_off0000fdbd.bin
caef0934edd1203e2690be0410f4cbd3e9b710c6ef836b80bf5b1c2cf1ff810a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 10080 bytes