Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4e5cb2a4e048c5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 20:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 531ed26cd137623324510951958586ad SHA-1: 38f7c1f6e7898b7cf98a1812698e982783aa4700 SHA-256: 8c4e5cb2a4e048c5bf13e149688fef1e5828780225da9b11aee713b205d22d52
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://le-nora.com/userfiles/file/wusevazu.pdf In PDF document text
    • https://namhunglogistic.vn/site/files/84441668877.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/fuxazidofomumobagixe.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/bafufubifozelolufiwegor.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/47603321901.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/87106048326.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/30405935699.pdfIn PDF document text
    • http://popmetre.com/news/files/25634525112.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614424e244bf1---tasusedajekukir.pdfIn PDF document text
    • https://refoca.cenacat.org/yiicms/ckfinder/userfiles/files/jojujegakekogi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7229b2d76---39837225042.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/dojizolerurafufoli.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138d4eca2caf---wexadesanil.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/61712639757.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/72284790618.pdfIn PDF document text
    • http://daliangluyinpeng.com/userfiles/file/zezasadedatox.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/14591872422.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/vudubijupunizasuvuke.pdfIn PDF document text
    • http://saimiri.name/upload/file/2317981503.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16136881213df3---14346779304.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3e162d5549bc67a607c5ad91084113a0/76158961735.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/lujebufosofep.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/doxetulekitigufemaxigut.pdfIn PDF document text
    • http://esistore.de/userfiles/file/wisojisalivivulivi.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/56028006695.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/51512759494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=business+research+methods+bryman+and+bell+2015+pdfPDF 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_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 16684 bytes
SHA-256: 9d9861649d36df0a7f23b88e9659ecf28fcdd85fcbb30dda8ff857d3abf94efb
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 11720 bytes
SHA-256: 6af907506042d2c83cf8fc921589b4b77c1d18e7d966fbf9749db9696cf6c716

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