Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eda88d31d2f7039…

MALICIOUS

PDF

78.4 KB Created: 2021-10-10 10:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a17f077bfafb237c0d343dbb777fca1 SHA-1: 09d2bfe5de6a09dd510f5be1d5defd4c1304c465 SHA-256: 9eda88d31d2f7039bbf870b103d29f59c1b7696fab1857173ad2044aeaf512ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing scam, where the document likely prompts the user to call a phone number. The presence of numerous external URLs, many pointing to disposable hosting or compromised CMS uploads, further supports the malicious nature of this document, likely serving as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=phone+number+to+get+a+cab PDF link annotation
    • https://pasationtravellers.com/root/FCKeditor/file/bezaresodebexira.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/43827831533.pdfIn PDF document text
    • https://novitas.ro/files/vebuvijenifewovev.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210921_F9A26CE60E436379.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fa588ae198053d885989ecc167a7bbf9/mejobu.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/13838717639.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/pososogejufev.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/39254425482.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/13086952424.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/tupopagigobo.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/87333168383.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/fowidijowevusasuma.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159ac34aaacf---biluguzewudoteludofowasi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/timejunojubade.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/40643997061.pdfIn PDF document text
    • http://hasyo.net/files/file/66723995531.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/67010006045.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/susazisepir.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/powasefoxovafanu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afcc02e604---29127157497.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/nijexowotatajipiz.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/mefobevumeweduseketi.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/nadodiwofekivebenufibox.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/dumosumenerunilizer.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/63428997084.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_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 18700 bytes
SHA-256: ce8c6dbdef31272911d15a535f2f85e01ae4f785ed62ee574773f484e1d94e83
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10612 bytes
SHA-256: 0ab93aae2342cda5a685ddbd084884fafb7f0e951cacf7bfa81cec5c7462ff74
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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