Malicious PDF — malware analysis report

Static analysis result for SHA-256 d306c7aa5a6c0409…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 03:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbd868cd7742b90310401bed432869cc SHA-1: e56f99623bb8fd771d48f4c5248f76f1af21a990 SHA-256: d306c7aa5a6c04092a3f60b562a497ca4c09d92029187e3de7606b5f61fb7bf1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document exhibits characteristics of a callback phishing or tech-support scam, prompting the user to call a phone number. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised CMS upload directories and disposable hosting suggests a mechanism for delivering further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://czus-lukasa.sk/userfiles/file/togadabusatasitan.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fb52a527d12d281035f64bb12436396e/22373675392.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/bijarebuge.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/7308737538.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5b09bf83---sagimagabedof.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/76387880983.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210918file///32731429788.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/92452104404.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613177bb28349---56937163869.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/23892347322.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/51744332624.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/60972157345.pdfIn PDF document text
    • http://electric-kernbichler.at/66584624603.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210920081642_69ww1x.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/figosewenixedevines.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a265a90175719e53394af0d8de1c0e55/9719479265.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/borarefojanikobemorebewek.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/fojidaw.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9966e0cfbe8f69ecaddd01472ad8082c/pokakamilogeketogedu.pdfIn PDF document text
    • https://datawire.gr/files/files/43845268134.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xolefuribexudurekoronut.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/dabinusimosubawa.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb9c02937---sodilatiga.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/kovegopubititalo.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/woxemadufumerezexasu.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/81183070845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=aw+free+video+callPDF 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_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 10232 bytes
SHA-256: 9dfa77ef0b37e7b1dc7a753823a9e6259e2e42f93e46d5cb14c3e557eee95d14
font_01_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 18196 bytes
SHA-256: d7fa60d7c2b7f479927c07a400da735d826513ecef9e17eaea8151d02a0b70ff
font_02_sfnt_off00012fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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