Malicious PDF — malware analysis report

Static analysis result for SHA-256 a512af9afbb3f927…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 03:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ecdeda855b455fa5edb07404a05edbf SHA-1: 1c5a0af63fe3931f96ab8b1934a127c2b826afea SHA-256: a512af9afbb3f92707a8e1571fc6e72f1db6904bcff490db121b30325e7706b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of compromised CMS upload links suggests an attempt to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://otvorene-srdce.sk/userfiles/file/zefezofijux.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148dc84e6075---vorodorirupopi.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/48452742341.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/vaxasurixajijopitesaxakaw.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/34680100982.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/pesevapuniwuxexobatiwiwo.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/24414687351.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614749caa05cf---molapoxu.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/fanadakeka.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/zobeza.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/lodezater.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/miteteru.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fae382845---vukakumibidabibuxa.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a9fd19e7---tagofaxetizuputevobagak.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/gusazefabuvibovukubarunod.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/75282606090.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/2945002501.pdfIn PDF document text
    • https://linker.tw/files/1556605169.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/dadf52884793633b659863d72be02036/36988981228.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2caaa0edc373a27b01a6ba86d222dee/38698155598.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/71010426424.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/56455216377.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/29052687055.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/22965941582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=monster+legends+apkPDF 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_off0000b1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F4 10560 bytes
SHA-256: a0f6af94c54a6745cdf9cb597c16d983fa0860678604d9a57e1cdb87c48f3768
font_01_sfnt_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 14932 bytes
SHA-256: 350171a103f87f31bc2eaaa3b6a760f62f9c187f39e331e836cce74771c36efb
font_02_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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