Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c3e1e2bfb63f5c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 18:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 873b52969abfda77fa72e796bb9a0417 SHA-1: e59ad69e412386ebd4a485553c6e1939c6ddaa32 SHA-256: 43c3e1e2bfb63f5c152b7a3fa2ff0f1e578a3895f5965376241ffae0852ed309
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://adwokaci-pila.pl/userfiles/file/48752588805.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074297dec4bc---notogazewakadozozepamufu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/muzalifetisigude.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/77617714143.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zugidasutagebenunezod.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210728_E1D21C811EED9270.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d854b425---vaxarorapawupi.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/pegifusegizuleriguli.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/160439765dc294093cf46ca525340636/10047694240.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee465ea4b84---rebesopo.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/25999391439.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/todojunafe.pdfIn PDF document text
    • https://cmoretv.com/userfiles/nafotefumizipijimemem.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/98263407954.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/cee2d8fe32aad6c688e37acdd80f8aca/9110380016.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/lotanekekotipexevefufipaf.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/50561600878.pdfIn PDF document text
    • http://renovator.cz/files/file/60665252698.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/78761890275.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5cc72105ba83264eadc9f3a5e1f67b6f/kegivifawofa.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/didev.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/3370578919.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/50329216718.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/05cdpgjho4p7pnu91fjvve1t59/37286144983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=alcoholic+fermentation+in+yeast+pdfPDF 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_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 16896 bytes
SHA-256: 43c48295aba609b3a94723d4b7782d868028f505977b1fcc23ef5ca31a4258d1
font_01_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 10980 bytes
SHA-256: c52e1635501fbaed28e0707c0d146d7784ab466ba265a9245cd80cde1cffe689

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