Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5eb85404ab3e54b…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 23:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c3789e83723f5674516f2c5d4253372 SHA-1: cbae5a9ad64e421f98c1dfddd5890e965c2fb37d SHA-256: a5eb85404ab3e54ba13032fbca4d9e07e6872524742aa0d989ba4276733deca9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. While no scripts were extracted, the overall structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a171e6e3a5e8d669a3820c78dc65b4cb/nepepawudepisi.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/122b7d1de0be3a50acd4e23cd0b249cf/89270330319.pdf
    • https://aulacvn.com/upload/fck/file/zitemip.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/95d55881621fc9a50f8793d508f53726/50147440709.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33f29df32---40920141227.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kh85ounp7nakpp8j9qen8bqnqm/rofivasejad.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfdb382ef---96907183768.pdf
    • http://aaaexpressac.com/userfiles/file/12328498258.pdf
    • http://amdind.com/userfiles/file/vejipipukezojijiriwivazi.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/52f0d225fcb93e1a30132457275b55b1/66394191152.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/0f71f6a2f8b4e8672ac76674bce5b422/56602919904.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/482ffc7e48e3ef593b419517215b3a8e/ledexoruzenifibiniju.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a8df681fc5a3373448fd21e161270ead/35441472660.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/46b96b98c98722648b1d6f00986907aa/89017448693.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/30ttv1kogrcshskbgi43d5m6a5/74180628507.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba64b8171---vizikejamujumerag.pdf
    • http://angelcabrera.com/FCKfiles/file/lajobi.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9446fded27918f8a5ff32f9cef1653e2/fopatumugavosadiwebarara.pdf
    • http://iphysiology.ru/upload/83501216746.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7d61372jme44eqq98inqfnhks3/dopabuvelujo.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/p5i9cegtlrm7f58m69p6qv89b7/33518185274.pdf
    • https://ktmcollege.org/public_html/userfiles/file/kefivap.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085867be8530---regowimupugexu.pdf
    • http://okfilm.kr/userData/board/file/tetoxanolawetoselenaranul.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0e068f7d863b78ed9ee005d13bf57c6f/sanejepopizejegaxural.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b25ef41b64---61529420732.pdf
    • http://hungbuloon.com/media/ftp/file/buzupapibiju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=things+that+start+with+c+preschool
    • 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_off0000fc12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 16792 bytes
font_01_sfnt_off00011429.bin
89d634209efc94e89b1dc9052bb36e90e01e554ceb3322c679fe3efac5db0c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 10700 bytes
font_02_sfnt_off00012cba.bin
1e1320b6ed968f65051c6074e5e3c6250485c00937d2d9c3a49037b4a7dcf8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 16728 bytes

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