Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bbfacdf305c28d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 16:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46e7441fc2afd5bca27139499905f44a SHA-1: 3ccd56f35d3363b68986d8882ff26eea75e4c373 SHA-256: 93bbfacdf305c28dbd1ec29e77b59334507d2c36b87dce825fc034da895f7a56
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ajivikafinance.com/userfiles/file/73883315449.pdf In PDF document text
    • http://villaelen.it/userfiles/files/kolagosetavufegatap.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://golden-candies.ru/webroot/files/files/tuxojifepobi.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/aolr5uvjlkrbos8jla58l1apkp/tumijimiwovavofijamepuxa.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotinafajofiw.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/27552062029.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/78494975727.pdfIn PDF document text
    • https://atl-50.com/files/file/19310323725.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160852e8b0e19f---74298761513.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a894d970f---41640926171.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835e27b5f0a---71814856567.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/74036904312.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/fuguxukesogij.pdfIn PDF document text
    • https://krossi.ru/images/content/files/lafapepo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d32261f8c---xoberibamebuwanusuxubine.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/naukfho631lfuauj3g79lcv0p4/jubili.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/sivebijagumofinilubux.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/wiberapusitiwupiram.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/zebemonux.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/pedepofenabinunagojix.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/wivenikalidi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/59209224672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=great+wall+of+china+phone+numberPDF 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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 10940 bytes
SHA-256: c00abdf814fcb2eed9e275709dfd56f032478dcd18a2223e9d4b3ee6ef73e486
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 17628 bytes
SHA-256: 837f1a54d56428c24e79c16db1ae33de73286048e3a5e1c8e6c860e6acee7dae
font_02_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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