Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b274f13e4fb1312…

MALICIOUS

PDF

92.2 KB Created: 2021-07-26 11:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a199250aa20370e3bd3aa3a1916f89a8 SHA-1: 82ecce8e0d1e885a9e5d46bd6cb1d586953935f9 SHA-256: 2b274f13e4fb1312cdc1d204a3fab9a9ad6792d0cd6e6bead5d9a1f792a8e3b3
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or phish user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160734655581eb---nipesaferesusobepamaradid.pdf In PDF document text
    • http://eaupureinternational.com/userfiles/file/galade.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073e11d5f64b---17024662179.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/69681589824.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accc7e228ce---lepatarirugogo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/btvkdf7aigme7dm4jou92prqm2/lewojipuxogegisawufa.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/zuxoxipanare.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/46vl4dmqsh8h1bpueakkdvm37q/77671978908.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21524412514.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/gorudozulixefosas.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/005724df0a6d2cbfc19b0d00854671d3/93780745084.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/28651085400.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/11152100902.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/negodogudexavesegoparular.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ebe7b97e3---28512804435.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3012c74093a2c0cc461171957b7b07f9/28938464743.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/losiva.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/biwimizepasusuzikusosufo.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bej5eqpmac64b6eg3cn2n9i5v0/33083405551.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7fc4216e311bf9eadb2566a8ce2914b9/zifonase.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/4b7af9d8c0cc8b39c4e0e8c64bad23a0/vajemiwebituwaf.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kipinogiseledus.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e0882bb9a35ed01f3afa6e5e5f401f73/42415298817.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/78246400633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=do+you+need+a+license+to+do+eyelash+extensions+in+paPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3096d26e8b0c96dfeed00dc0f298db53/pedoj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 17564 bytes
SHA-256: a0c107fa9fff6d7b34027b28cae35713a49da6aa71767dd05088f1655fabb1ce
font_01_sfnt_off00013134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001494b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494B 10828 bytes
SHA-256: 7cb839a6bc5d347b7b078d5db9fffdfff2e3054a5ec185cde8acdf4f41018151