Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b287ac9ed37ef51…

MALICIOUS

PDF

78.4 KB Created: 2021-09-10 05:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63a95340fd4b627aa5245e443dcdeb1c SHA-1: 6e9997bd64e470da0f8060494adb4793894f919e SHA-256: 3b287ac9ed37ef515f7f20343e8192da419411e2975ae87b4a87d5cb9ad5c7d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. It functions as a link farm, directing users to game-related download pages, and also incorporates callback phishing lures, suggesting an attempt to trick users into contacting malicious actors under the guise of support or billing issues. The presence of multiple external URIs and the nature of the heuristics strongly suggest the document is designed to lead users to malicious sites or engage them in social engineering schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=clash+of+clans+unlimited+troops+hack+download+2021 PDF link annotation
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/revamizesifakonavobadalas.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fegpg4sk07hmqk1aujbvu5ffpq/38414360598.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/18661590035.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/43259138506.pdfIn PDF document text
    • https://ijp2.com/contents/files/kevojexepexudude.pdfIn PDF document text
    • http://ladna.pl/user_images/file/pojurerakawujowiwox.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/galotoberogutavukujeda.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202194151016307.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/lagabaxeronukususogavifat.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/fimavebepod.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210910071531107.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/98408461169.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161351efc5b56a---67669120527.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/edc07ac8b1cb619901cab6a12e34bcb9/sobuxojifib.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/50389634314.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/mufeja.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100612408130.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251ab13d59---tafobonega.pdfIn PDF document text
    • http://erdbau-rauch.at/vixiweferogisirupewokom.pdfIn PDF document text
    • https://polandpools.com/contents/files/sofavanoriwodutot.pdfIn PDF document text
    • http://4rrecycle.com/files/file/ledubosepafepasadisamaton.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161353b93ed70e---67313238343.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/59661920843.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109052334465076.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/17413645010.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_off0000cbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC2 11488 bytes
SHA-256: f23086153839416e718cd95927b0be970bdce6004af77b876302ce8f072f03ec
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 17236 bytes
SHA-256: 182dc14e4c9f75e170334b661dd61c571abb6225372962fb88fbd0c48c844d1a
font_02_sfnt_off00011393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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