Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfb2bb8fe928061…

MALICIOUS

PDF

95.6 KB Created: 2021-07-15 19:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6be81c65efdabf2ec118915f95110878 SHA-1: 606d5a72a0d8a2de34453ff95fcef21a84092541 SHA-256: bdfb2bb8fe928061e6d10578a13128cc939c351652506d80a44dbda4bf5158db
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=caption+for+new+product+launch
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59b995575---54805641029.pdf
    • https://norservis.com/files/files/42675469660.pdf
    • http://cascinamana.it/userfiles/file/92158404727.pdf
    • https://hogies.com/includes/template/uploads/file/wexogib.pdf
    • http://agendatourvietnam.com/hinhanh/file/dimenupo.pdf
    • https://bazab.ru/ckfinder/userfiles/files/13595540135.pdf
    • https://aradmissions.com/ci/userfiles/files/83813287688.pdf
    • http://ledson.ru/upload_picture/xemuberizopigapepu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e9ec8bb7---perimumuguketaruxukadaraz.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e7863a6ba5187cb418fd8f711dc227c4/bofanutigalomopipowabuv.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a80c88b159398d022392264536d7d6aa/rozidoto.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a77217fa20913d50d630877540d3e63e/60444600827.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d94fbb26bf1e762436f82786d8b28765/dubenajesugefemowibef.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c97af3211---72433063527.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fec9808c395ab40fcae722c37dfeaad/dupubasuwedawutede.pdf
    • http://bogelaipigeon.com/upload/file/31170538180.pdf
    • http://househouse.it/userfiles/files/59200878644.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33b1a07dd---zatifut.pdf
    • https://aravlicraft.com/cmsCart//upload/file/75295954559.pdf
    • http://giayviettri.com/img-ftec/files/62679123203.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076a328f2923---11612775088.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/01171f63edce470dec6f044e10d7d3e0/48032092179.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcfa78b308---tokawifamorujatok.pdf
    • https://ghnservizi.com/file/tifizufewi.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9cg4dsfjoo0gu3mbkedkrkm9kj/zololedaxunerotutixarusi.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_off00011285.bin
56f40e407f7af4d560ff60df03b6260b62d0b101c5172eb087256647b141447d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 17448 bytes
font_01_sfnt_off00014032.bin
3593d1eff2734f1b1c02fe5509dc0ed41b7827bac83cbde9f8a9296aafd013a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14032 10768 bytes
font_02_sfnt_off000158fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x158FD 16792 bytes