Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b286a5dac7253c8…

MALICIOUS

PDF

85.9 KB Created: 2021-10-04 20:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ee2c0f468b9355c1106f72dad8c1104 SHA-1: 514e2ae8e0bdb9dcc88b07ee19de42bb691f1b20 SHA-256: 7b286a5dac7253c8564507614f2c537590c9031019237832fd9c1f07deecf766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://cssh.es/img/file/jimavidabunogokivu.pdf In PDF document text
    • http://inwama4.vn/webroot/img/files/jubawowelowefufizoda.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/42267948283.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/2109161322396835803ijm5.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109240909078202.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/95511447579.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/nomapevasuxi.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/27331029828.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/befenapenogesadozuxomabin.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/sugotozim.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9897abae9---62759030381.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/galefawenen.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/98450928234.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fi2jd88niqo96bafh6sas47h7g/tibizoj.pdfIn PDF document text
    • http://creationart.hu/files/file/78001686226.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352f7cb4ac9---xulewemewemigetirerudisox.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/saxuwogojub.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/serutajovafudijaxisa.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b76c8594df94532383b4c4e635d65dd8/9632747152.pdfIn PDF document text
    • https://jagominum.com/contents/files/25647187683.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/pitekemupokixuxinad.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9f41bfebf5533cc83b928cdf187821d5/gemofudapegijagizisa.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139045a22c35---komovatexepuzeredafu.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/vuwojadubaj.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/deruvezinapebepotog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=population+of+pearsall+txPDF link annotation
    • 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_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 10556 bytes
SHA-256: a6d2a11aa615b08b0909539605996f7916d12c67d144ed084f1adaeb3b1fe58c
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 19664 bytes
SHA-256: 336fc571946f8f04b7f96f93cbfd356ef078e6deaf307c7a4bb5c3c0dc367ece
font_02_sfnt_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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