Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a9648fa323b042…

MALICIOUS

PDF

94.3 KB Created: 2021-09-07 04:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c83790785fe64d518b7c3cdbe6d3b0d SHA-1: 0137c1ad04a6fee50c24eba0e4e2c3790bf92c2b SHA-256: 46a9648fa323b042e9f8b09cbde3c6ee4dddaf693f071f9cfe7889021c924876
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://driftwoodcc.com/userfiles/files/loxuku.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f722a27a56---17451131352.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/cc2e7e4102490bf573ad6213c811a95d/77739434007.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b932b743---75612793085.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/42664261229.pdf
    • http://domadoma.cz/userfiles/file/poravetopegel.pdf
    • http://atdawnwelift.com/userfiles/file/modobaburu.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afad989c750---dololuzigogewu.pdf
    • https://foodsafebox.com/ckfinder/userfiles/files/32371659819.pdf
    • http://jtour.vn/userfiles/file/657597476.pdf
    • http://werder-ritter.de/UserFiles/File/28959090049.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c7373aacce0c102119ff3418ba42bd34/dobitumifulusiputu.pdf
    • https://chataigne-cevennes.fr/imgs/files/rewumatofalanapob.pdf
    • https://chmelo.hu/sites/default/files/file/33026153957.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06e94dfe5---dorogovilurifir.pdf
    • http://tries.cz/media/images/upload/file/9272335911.pdf
    • http://www.vnos.vn/app/webroot/uploads/files/48258816248.pdf
    • https://tolgyesvolgy.hu/userfiles/file/gebamafovejunijozuziwis.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/40673258120.pdf
    • http://www.iece.in/userfiles/file/8431037731.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jee+main+b+arch+question+paper+pdf
    • 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_off00010583.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
font_01_sfnt_off00011d9a.bin
68b7d1b20fcf12051893ecff7a3d7c1d27ffb04f1fa6123e9c2f0d4b3ad52690
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 11216 bytes
font_02_sfnt_off0001373d.bin
e04143f8dddad0f0f4743ebe73b37443eab12184e814d6eeb240d031d1181e42
pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 19920 bytes