Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2676f2f1caf0f08…

MALICIOUS

PDF

80.3 KB Created: 2021-06-29 07:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e95b56c6318c1ad89bf4e2fb5dad5420 SHA-1: 921af17016d09f89fdc0b076d73c20125f891a5f SHA-256: b2676f2f1caf0f0801cdc5e3049243adb51af5626fdf4be9fc22f3dd9ce828ad
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites or other disposable hosting. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://dentherapia.hu/files/file/gitotedewana.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/df618ba261fb8773cba1e9919cbe2578/72439118801.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671456bcc9---panewekugubarurabegovim.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/1bb9c7d5e153176c6b6bc7dafffb8552/40213158461.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a44e0a2097f477b62855d45d1d52df60/waxovuxatup.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a226a48db---zuxopakipewu.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759204a4bc2---nabakuxogopurovadazovagi.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jvcl6v17fm847lf1np014otb3a/49048078279.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e91f4f3a49cbf22ed2fb11c3f7afab9b/durafigojafotawepaw.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec49e9f29---dedugebitilojako.pdf
    • https://aurorabersinar2.com/contents//files/tomelipajitimexatek.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/aa4acc2a411a43612aa199ec795b8c83/76140565576.pdf
    • http://scamps.biz/userfiles/file/18729274532.pdf
    • http://evevoyance.fr/adh/.-/file/77241652357.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/30cd0a326f0800e6ca5af2ebbbadf125/7780618440.pdf
    • http://holzbau-napetschnig.at/mudopoxupudevamesakiseva.pdf
    • https://nhorizontours.com/userfiles/files/16012197786.pdf
    • https://computerzone.pk/file/92153713829.pdf
    • http://fresh-j.info/images/uploadedimages/file/38594998278.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f28b47a32---57602292246.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901fa4f0cf5---38162327067.pdf
    • http://alanurturizm.com/rsm/files/22396576722.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf78dbe66---39129532490.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/poladaxumatukovavidi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=securing+the+virtual+environment+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_off0000d5a0.bin
5c3aa1d71061f766eb194c3985281496ead49fb788c33838c0a8ab5021fd4b42
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 11140 bytes
font_01_sfnt_off0000ef43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes
font_02_sfnt_off00010755.bin
c886995f4cf6c3a0390f8eef78e0fee79f3a3568c25f0b5246a5a0bae8178ba1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 17004 bytes