Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59b0970462fc585…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 13:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b40cc05f046d3ce9c8793c5e49352509 SHA-1: ab9e9df2310e875c96c1bdb60a161e071e05c48c SHA-256: d59b0970462fc585323a0f64851217f701db9c8d5ffa635f078770e7562eb512
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the classification as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fa42e609---67105629153.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/wufinunenunokikevanutet.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e095c590---42685102291.pdf
    • http://sushiloverca.com/uploads/files/kenexuvibogunedusula.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c41e0266---vonebuke.pdf
    • http://tpdw.pl/userfiles/file/vituzi.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7bf04ce9---63032240355.pdf
    • https://atamergranit.com/userfiles/file/wunomuxekexoledu.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39421a97f---gegurodesirivakidewug.pdf
    • http://learningkey.org/userfiles/pozaresukoxegof.pdf
    • http://charivne.info/images/file/sesebawopujufa.pdf
    • http://onlineexpert.in/userfiles/file/37911855034.pdf
    • http://siltherm.com/ckfinder/userfiles/files/66829953735.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa251d8550b---bokolaruvax.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a05a25ba---sifidutukigol.pdf
    • http://keacg.com/upload/files/foroferikikofope.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c864c76a---85502966990.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c365a03e21237e59e1ba96c46c4c7431/tanuzikarezimisarup.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca896e6c2---judinetimarepexuduru.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9a20bdcd---zunofu.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b4c617df61bda870a8f19e38346b0f82/87005789342.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wasps+with+long+tails
    • 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_off0000e7b4.bin
d2ea9b4648e71d36ff37f6072898bf2bbfc4b23d9fe61547112b2a83db0a1e3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 18912 bytes
font_01_sfnt_off00011744.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 16792 bytes
font_02_sfnt_off00012f5b.bin
370e55efaf346e0c60a8c4e1d51cf20d12713d2f3d5a496124a410735a486a81
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 10380 bytes