Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3c25983526c3d9…

MALICIOUS

PDF

82.1 KB Created: 2021-07-21 11:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df461a2a0e3d0dade61440d3dbe1038b SHA-1: 338d45ffe2cb3568108006a89db7bb9f36d45392 SHA-256: cf3c25983526c3d9ee7f18213c0231d807acfc36ae2ed79b17c1c9d384b120ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution through these links. The document body is unreadable binary data, offering no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bff2d98ebe2---zewasivoxasukaxolibadov.pdf In PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/72904110001.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076324dc3ced---42993638084.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/46959766059.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/29287791390.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b61002ab3---4248817215.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/284921516e15138633782dd15c7a2078/turifexewogititapasuw.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0o79f891dh2oupm8falmq45r27/49297653528.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/48342453552.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5d839207---89307914754.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77b64a182---18525514130.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/92d729e48075348aeb5e7f1648dc9718/lisediwadaloguge.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ba3a4daf00c1f81dfe9dccb60edee5a0/livewoxirivez.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/85544074362.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c82d8795---zezibuwipidemutobinopefo.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/23898394056.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/10779155252.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/21479793697.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/8go1n12su5gtrjasvcvisp4g9u/79614154145.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/h8vs9cpmrgf2qui6l1jhd588gd/lupitamesunanobisusorive.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/wenimegefajan.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/96070606595.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/68274746010.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/jeroneserorazikoke.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4iidsltp3bl5vcf0k9f9maq376/26124697419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+a+cost+driver+give+one+examplePDF 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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 17600 bytes
SHA-256: 3c83234dddb62542e3721fce2caf8020c8e1e5588aad2b1fd40b4a6f441727a2
font_01_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 11124 bytes
SHA-256: 737ca7403c3ea6f03746574ff052f1b26653ef11469cbaf61c86fd4023de26f1

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