Malicious PDF — malware analysis report

Static analysis result for SHA-256 2097ee7ea868a952…

MALICIOUS

PDF

84.3 KB Created: 2021-08-24 23:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48ada3ce2f11a1d6868768434b51e42c SHA-1: 98471c1931ac885f4aa432a701f84b083f2a98a5 SHA-256: 2097ee7ea868a9526cb1bff89a75d07ff8141c67f60d379708ac9694b86375af
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains, some of which appear to be compromised or disposable. The primary purpose seems to be directing users to potentially malicious content through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://keletunderground.hu/images/uploaded_pics/file/27075836421.pdf
    • http://staresecurity.com/userfiles/file/pometiwonawe.pdf
    • http://polimak.pl/userfiles/file/72111239625.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c92dbfb656847cfc4d43610da5dba498/9319427077.pdf
    • http://reclameindex.nl/images/uploads/76212817571.pdf
    • http://kcemsp.org/upload/editor/file/37960450562.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ujafl7mu1sji1thip6qjlfb675/94452784485.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/94130938770.pdf
    • http://condominiobrisasdelnorte.com/userfiles/file/xitarufisovetabowuvig.pdf
    • http://tempatpasang.com/contents//files/nukoretiwezenu.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/nipifelovajalumelokat.pdf
    • https://xo-sound.ru/userfiles/file/tipedalopi.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/fcc4fb52f69ccf4e3e29e7e293d1fd5d/xomopubokexanibapivavag.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6076ae2aa---wuwumigakegowuwevaniwabe.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c222724fa---defixi.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/eg7udlse356mcrctigst8c3n2e/23689218516.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/69itumut8s3u9cnqhoe77cr27d/potomurud.pdf
    • https://dichvuketoanvn.org/uploads/files/91117626299.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161074c32447dd---11242539879.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0687a58d14---jafuwowujo.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/bda2def6c9eef459da414ca6e7f14013/vibexiwig.pdf
    • http://koreaseowon.com/ckupload/files/27713002814.pdf
    • http://clubselectionvoyages.com/images/file/55879750994.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608069673aa24---mitulipimewidepijo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=katy+perry+miley+cyrus
    • 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_off0000e43d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 16792 bytes
font_01_sfnt_off0000fc54.bin
1fc8ca101f20583dbb0155904cf9136e048b323fc760316b6bc4a178c7ff14d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 10516 bytes
font_02_sfnt_off00011457.bin
f3077028f2a52d638a0a952fd2ca17aad6e347964f6e3d2f5687a14c5a2401e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 18004 bytes