Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f0ab6aea96ecd5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-22 21:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9169ec6d585b966581339c6995897bd6 SHA-1: 251113e25a6b3583e6e6cc3319320e55c651f91b SHA-256: f0f0ab6aea96ecd5665d862b6d60a4ca7fca0cfb3fdbcfc3966492a50a4a872b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to various PDF files hosted on potentially compromised websites, which is a common tactic for distributing malware. The presence of multiple PDF link farm heuristics and the detection of a 'Pdf.Phishing.Trojan' by ClamAV strongly suggest a malicious intent to deceive users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135d12bd69d5---xugidavofubelodalo.pdf In PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/94847419699.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/87591682306.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/vatamuwemigatawivut.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/lixupakabelodepeme.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/godakirogikiwibawozitada.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/pugip.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b6a7eebd---vojasavopibi.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/77433633087.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210901_161912.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/6276447601.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a279e5636---25590123963.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/46922861473.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/61822315877.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/76839468785.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/sasexozezemofivasi.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/midaborowetepop.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061002297465.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a4a8441a65abff78e3b8a179527e3f5d/xazatabowupefajifewelura.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614558d204fd4---12577316091.pdfIn PDF document text
    • https://birotex.rs/images/files/kagumogixalos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=365+days+fullPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/95728017299.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_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 10292 bytes
SHA-256: 557ab400866477f97756abd1c6d6c0d6dc3377a87508045cc183592343fbdefd
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 17328 bytes
SHA-256: 7d63541824306ef03e70fdaf85bb5333ff0141d53a0d8f5c561139640ef16959
font_02_sfnt_off000110bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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