Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd8412de9397172…

MALICIOUS

PDF

85.0 KB Created: 2021-06-25 18:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 563ae05912343079b68a2bc53b5e4e94 SHA-1: f1067faf56e023b990acdc76921c795fd62a2145 SHA-256: 2bd8412de939717204e22ab4d9188d89c3daf7d6c2475ea985cdfb6814a340af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strategy of using disposable hosting and link farms to obscure the ultimate payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/32dec2ccaf76c33f33493808ad705f55/75084132703.pdf
    • http://amandatravel.com/userfiles/file/81105918130.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608413d695114---66870738990.pdf
    • http://omonetach.pl/foto/ilustracje/file/jidalebuxoda.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075966c38a40---68956460847.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160871e0960b79---lefugenifo.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089df840ef6a---gekofakoxijopudedenupeja.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8785af490---73139386565.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/pb76dgbq5ud2cbf3pcqv3ujr41/41990860267.pdf
    • http://rurisnet.org/images/file/78262831806.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/e7j73ea12urpvbnc2kv57fpm3h/80228026944.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde37b4f34---30244942298.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1c1603fa7---nezokikimidoburufezuvavox.pdf
    • http://chapelguild.com/images/usr/xogetino.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/98389752750.pdf
    • https://bestcoloringpages.com/userfiles/file/22542863921.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b893ec4500d---xegedisumumikiwixazov.pdf
    • http://wsp.pl/userfiles/file/39637730416.pdf
    • http://meble-tk.pl/userfiles/file/nepofelepukuge.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947438c024f---29941253257.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/97760409387.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/51583470863.pdf
    • http://csc0451.com/userfiles/file/20210619175330_80kl7n.pdf
    • http://thepokeluau.com/uploads/files/90207656583.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=administrative+assistant+resume+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_off0000eae9.bin
feeb71cd46f1555d9aa74d83ae5707b57478930b1f0d9ced8514a48565363ed6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 10640 bytes
font_01_sfnt_off0001033d.bin
ce762253b0e4787e3ba40ea9245f9c87746ac7b33e12e36ee7e85316f2f6b0df
pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 16712 bytes
font_02_sfnt_off00012eb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 16792 bytes