Malicious PDF — malware analysis report

Static analysis result for SHA-256 33050a57b0b81d1a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 20:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f61ed21d825c4f7c2627ed8e91ccfa4c SHA-1: f5197c98fc0418dd72f3e370501993cd9970c154 SHA-256: 33050a57b0b81d1a9003247f4ca84a3559e69ec0bbcc8160235f2652ca92676b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, hosting numerous URLs on compromised WordPress sites, likely to redirect users to malicious or phishing content. No scripts were extracted, but the nature of the link farm suggests an intent to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e37d0d64---10469333078.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d478978a2b---91615198822.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/bewasofe.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a266db9a6---dulonosajujasixo.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/35365147475.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/vawudili.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/i3udm6ot4ot4lveh7j8rv1ej37/6953733466.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/89830527625.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/5e4a3d1dc96c5e8199ef272037fb1d8c/xogupuvazilo.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/40687287420.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9feb888a7a---64286496599.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e1drq79v3k9kusjgsjs3tdb877/45401572594.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/27138814620.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pemalojuw.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/zudulapibe.pdfIn PDF document text
    • https://melz-feu.ru/upload/gasotidigizigiwekeset.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f083c5b676---wutezupusupametonuraf.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/64861290588.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba1baba42---42577796225.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/71303872086.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2e612f19e---nokunazutovoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=zebra+zt410+rfid+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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 18460 bytes
SHA-256: 4436b551484e35e177110bbcb9b86d3a490b6d3579c4e0b5a05147ce9001e3ec
font_01_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 10468 bytes
SHA-256: d2f7a24e65a85b7581eeac4ad99d123793386b8c09d4f0d053861b869ec0bfbf

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