Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfa81047cd8523f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 04:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49e01cfaeb424ff1e1a88e355fea6ce9 SHA-1: 9fe3bd7e5d6f6792889748604dac8967b8e2f1a5 SHA-256: 5bfa81047cd8523f31879d79415298ac8534a38392a1b32e3867f138682696be
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://brcassociati.com/userfiles/files/96994665754.pdf In PDF document text
    • http://yey.uw52.com/upload/files/nalejemuzagip.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1c7cc1a7---muminozuladomug.pdfIn PDF document text
    • http://teplospectr.ru/images/files/9191275875.pdfIn PDF document text
    • https://mkontroll.hu/File/95651564538.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331c7b46f84---zekonofunadugosibogat.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/woloxoribumefawoxaxowibi.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/32287834359.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/sagesumo.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/29325412115.pdfIn PDF document text
    • http://gibisch.info/files/files/noxaralenuza.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/77531075841.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210908031616.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/kuvawixagorudiduroxo.pdfIn PDF document text
    • https://yellowstonewildlife.com/zirawonivosobekasomemu.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/76301401302.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/xiroranunotojake.pdfIn PDF document text
    • http://zimmerei-possert.at/55406295912.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/siviboju.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/pamatos.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/totapajopavemonudazis.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613639a57bc08---32988818614.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/gupovoluta.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/26171474458.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/ganukejogerovemameligep.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/rurelaloxavomut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nature+wallpaper+hd+for+android+mobile+free+downloadPDF 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_off0000be97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE97 10896 bytes
SHA-256: 9fe41d36389bb982d533cd8e56616a7119ebf3c77bacc45f7f58f2d779036fee
font_01_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 15320 bytes
SHA-256: 866039a79ff1cd7c3dacfc43992bef18c948cbb841b3114154a98b8a344e215f

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