Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87df7bfc5342013…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 13:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e73210235c99ea7ce08cb2c55f67ca3 SHA-1: 5dbcc5bb5601ee3a0bc6aaa5dbbbe442f14e97c8 SHA-256: c87df7bfc53420131501e73cf6652991cef2bae0c5dc807f630077c5dbff66c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting, likely to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://expertcomptablecourreges.fr/michel_courreges/userfiles/file/rijiwajufolipiwutavizosot.pdf In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-8/20210708132315991396.pdfIn PDF document text
    • https://denimder.org/resimler/files/32684131705.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/jm1apceu9180a1jmp3pvjd0sro/remibuz.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/84815547871.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9d7514a8---93643788991.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63bc483ef7---zilipexadufozuvojo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abba5909c29---watubegusemufelune.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada0fb0165---datalefameri.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/50416425966.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/49281268041.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0115e62b4154a4f7bcc0c4fc0f9493d2/66195335406.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082fde87899f---zaviri.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/83777075116.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/95461650575.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac869a6148---davarelegivebafe.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/24968585072.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/linufugowetatod.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/dudirudube.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/60933247034.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7baca64803049af447028143c8d3b0a9/gidesojibudirilise.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/76659223428.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c43e6c3e---5468885552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pharma+pathway+book+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_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 10656 bytes
SHA-256: 8c42ed5435fea00b8df0fed22352048cfd37f8defef081745878cfdb4a45de95
font_01_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 18488 bytes
SHA-256: f5d3adb1dd411d0dd80bbedf3f26ef5b05f11aaefc0c53fd951a3260d437f88c

Open this report in the interactive analyzer, or submit your own file for analysis.