Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7d8802e4ff81a2…

MALICIOUS

PDF

73.1 KB Created: 2021-09-09 21:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f145a2ed51dc6579c51f7e9bc9e18994 SHA-1: ef9d948d28547495c530479fafd92ac3e4b42208 SHA-256: cf7d8802e4ff81a264dea3122be1ff466f879d076a0dfe1aed993fe8c5d08742
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm suggests an attempt to redirect users to external malicious sites. The link farm utilizes compromised WordPress upload storage and disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hardlineconstruct.ro/app/webroot/files/userfiles/files/lonajevuwol.pdf In PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/puwerupojaguko.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/64840318031.pdfIn PDF document text
    • https://phnews.ro/files/file/bigelaweron.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/40508716266.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/sisovebitizeme.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/13527892318.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/42754072874.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/tukobevakew.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/dalofijasopurogonijenisa.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/nakorefibonu.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wefab.pdfIn PDF document text
    • https://tsegypt.com/file/91494974392.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lidilipi.pdfIn PDF document text
    • http://domuran.pl/files/file/86730502877.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/49643997489.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/muwoj.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/dovivosifiwenotetopib.pdfIn PDF document text
    • https://seerupit.dk/assens/file/gevuwozarozaz.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/diwon.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vpb2i6e0usd73p89q7du1spjg4/xofevi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/dtanaqe1v2is8733nttsvo1ps7/tuvuvipimagexevasigexuji.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1941be3c223fd1d9df61edee1f41319a/55602206152.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613090cd8002b---31207043929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=libro+el+arte+de+amar+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_off0000b83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83C 10484 bytes
SHA-256: 340906c3795ab6fe3779c13a9eb034440e461096ae5e7f3b9e9969d79b60fa0c
font_01_sfnt_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 18388 bytes
SHA-256: 9d27dfc8463699877c861f0d5250fe61a47b6055b595293b43a8c944f01cdfc0

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