Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9454da4446dc6a7…

MALICIOUS

PDF

121.3 KB Created: 2021-07-07 06:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e3101cc6b566024b6d8cb6cadf4d03e SHA-1: a2504a1e7039130943c041ed958f220422fd5f15 SHA-256: b9454da4446dc6a7bd7dda1fdaadb8a58cb46fdebcfee93286a9fa790aa30f78
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs clearly point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945cfb9abe3---semijad.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e832e2a04---2725380830.pdf
    • http://tunesistudio.eu/userfiles/files/25018822448.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/096779f9ef2059620719f7749b57417a/wupadebimopili.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/660ll4vupk5haloj995h0855g3/5964145112.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082af8a0109c---91102821694.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/gajipavotu.pdf
    • http://lighthouseofworship.com/clients/44803/File/sosoninijunazorofezo.pdf
    • http://stroi-sistema.ru/img/puzoxexu.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f11277494bb0b48c3a6c6230b3fe44b4/sawera.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ca465647---gudunozipodixururezagojit.pdf
    • https://kaptenhoki.net/contents//files/98382287599.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g3fnkr2vcc6kjeq11bhoc28c83/82678442763.pdf
    • https://vietucmould.com/img-vietuc/files/vazigeledavome.pdf
    • https://its-bulgaria.bg/files/file/lurarupetesepibabususapi.pdf
    • https://seedomoretravel.com/files/files/luvofegufavak.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/452c5bbdb409f1d763ac5b808f86a145/29701285952.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/379726054f84b2a920d627f5825dc8f2/banubenufereki.pdf
    • http://allaboutdowney.com/userimages/90368897324.pdf
    • http://erdivigado.hu/userkepek/file/79784472639.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/53f50c2bfed2458666939752241ada7e/93063904940.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/worozotoka.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c4deb5636---jidotapew.pdf
    • http://perles-del-beya.com/userfiles/file/55368830271.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=5+persuasive+writing+techniques+to+remember
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8F 16792 bytes
font_01_sfnt_off000174a6.bin
22f637665dd5d617e030c4cd9835357e901b3afdfebc261eaddd3c751c2e75c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174A6 11348 bytes
font_02_sfnt_off00018ebb.bin
5b5d25d42d3b86b3e0c007bc82f5c1408dcd3d229f19f489b8b3576b8000bbb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EBB 18076 bytes
font_03_sfnt_off0001a880.bin
cd0358ad298e58f7884ce0baae9a2e8d260b0b37725887119db0645803f21d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A880 17700 bytes

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