Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1a9acdf1314142…

MALICIOUS

PDF

93.4 KB Created: 2021-09-18 03:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0843fc66c508f5fb1f295f737f881722 SHA-1: 52a0234a66fdc32dd008e417b450f0fecdb7d480 SHA-256: fc1a9acdf1314142ea3ad78d18f77e8a54fd221a863ff7a972f3a290c16c96d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to external websites, including those hosted on compromised CMS platforms. This behavior is indicative of a link farm designed to direct users to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://betonkeritesek.eu/Content/files/lojavagogosoziwemokemar.pdf
    • https://partetesal.ir/data/file/29803744723.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/kibipojanigedog.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2cfd173b213a6de45b9cd21988dd3c28/lisonidov.pdf
    • http://wittymall.com/multimedia/userfiles/file/57958197548.pdf
    • https://cityface.cz/res/file/mirukexevotazisoge.pdf
    • https://hoangvan.vn/wp-content/uploads/files/50433115129.pdf
    • https://inverpalmas.com/aym_image/files/42663678398.pdf
    • http://diysmart.net/userfiles/file/2222073282.pdf
    • http://cy2hand.com/userfiles/73034196239.pdf
    • http://naturalmis.com/userfiles/file/bakufaguvopuraruraleguri.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/kasipenodisegewuvo.pdf
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/45157850096.pdf
    • http://jongauger.com/ckfinder/userfiles/files/luvefigul.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b161de524---156921707.pdf
    • http://sahrugs.com/userfiles/file/28411197413.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3b3c00b0dda5a5d57b65747d0eaa7b28/9412090489.pdf
    • http://yves-segers.be/userfiles/files/28559311430.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614523a0e67cd---jebapu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cnv49op25gic9nqc1teeo325o0/95180063925.pdf
    • http://alpinist.store/sribati/editor/uploadfiles/zijukez.pdf
    • http://vector-food.pl/userfiles/file/82377246345.pdf
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/dazirefefin.pdf
    • http://nova-auto.com/upload/92451746163.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fox+soccer+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010705.bin
808b86852160e565cf90911a4c1eebb3f07bdba22da371dc857ab72a747cf734
pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10148 bytes
font_01_sfnt_off00011dcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 16792 bytes
font_02_sfnt_off000135de.bin
e025ca2afd44db1182018d86959e1409d28fbc1a7565baa59e21a222af2f7c41
pdf-font-stream PDF embedded font (sfnt) at offset 0x135DE 19388 bytes