Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad31692ea58e4f80…

MALICIOUS

PDF

79.1 KB Created: 2021-06-25 15:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 226ae2297e152785262850ee7a417b1d SHA-1: 57f054c6ac5a0641d362e6d2485f1f387c4d6599 SHA-256: ad31692ea58e4f804e4fcf7c181c27727b540c1aac0750d72d4cfb1cea28fb89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristic firings indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://almondzwealth.com/administrator/imagetemp/file/nomakiziriro.pdf
    • https://szabobuszrendeles.hu/files/files/satowapu.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071143cac212---towopimilesonagiwozarozex.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6b506512---67985093147.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/levogudodofujumaj.pdf
    • http://dok-vo.ru/userfiles/file/41306028613.pdf
    • https://bnbcostaverde.it/userfiles/file/77638113482.pdf
    • http://interno-kazan.ru/upload/files/budikatemudejoguz.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8293a85450---86327985388.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55996431f---sojijidiwugafilifavijar.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f022c44e---66478856878.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/newetev.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ba109396---sogemiwofaxig.pdf
    • http://videofilm-tv.ru/content/File/fijewiragevisigipigakiv.pdf
    • https://cuisinescartier.ca/upload/editor/file/13438800768.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/09us5k1pjk7ut9fr69qgaeieti/47122903024.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=another+word+for+suggest+in+an+essay
    • 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_off0000d2f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 16792 bytes
font_01_sfnt_off0000eb08.bin
84e639969b9bf8a3517fac1eaab6b558b7bc610c70b27cb390a837b2017c45ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10868 bytes
font_02_sfnt_off000103fd.bin
c29af5fa7b3cfec0ebe3f36950bea6427ab818bdd5cbc3e6541ed35e5877910d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 16856 bytes

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