Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3d05cdd2105563…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 21:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7d20586d2c4a6b894f57c509303e34d SHA-1: 431a96bc18e3862c7ff9276fbd0f7928a1f35e83 SHA-256: 6c3d05cdd2105563e9217e6c9660defd9e88575e600121545a98239622d45d9d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal a link farm hosted on compromised websites, likely intended to trick users into downloading a malicious second-stage file. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=how+to+cut+one+page+in+pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841bca0eb8e---tetusilevevunotolovogifu.pdf
    • http://dulichgiahy.com/upload/file/muxofosebekekajinajiduvu.pdf
    • http://www.cafeinca.com/img/public/contenido/file/2784326005.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d42600e1---18584260866.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085645d4a6cb---29982112352.pdf
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/3fa3cdfab143d55358c94a8a12440507/58983672538.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16080c30b4dac6---butazupilowes.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/26417d26370cbc4d0079dd98d6e982fc/pavanaberedosone.pdf
    • http://aeronautike.com/userfiles/file/lojeludutu.pdf
    • http://ed-web.cz/userfilesfile/28953324177.pdf
    • http://dunajecbiala.pl/upload/File/87923118557.pdf
    • https://dprkoreatour.com/uploads/files/pozorax.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1pboouddga3bhf8md6k2muocib/11965275682.pdf
    • https://xo-sound.ru/userfiles/file/mirodadiku.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca21eb0c01---vemosefisigoladanizena.pdf
    • http://amoy-art.com/Upload/file/62072910002.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/pedegidebijefamujavo.pdf
    • http://driver-jazda.pl/upload/file/41795318056.pdf
    • http://travelshops.pl/userfiles/file/jetevesujemawubudurime.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3d2bd0d0---zevojakegibag.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8b92246b---tetazobod.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607763eb0d61e---sizovisilijiwoxodaj.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80994281230.pdf
    • http://penzionklara.cz/userfiles/file/vedapawadek.pdf
    • 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_off0000f1c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 16792 bytes
font_01_sfnt_off000109d3.bin
16a3d79ec6c514d302a8cb200e5203124aa84cb57c15f9f8dec10c37666ca298
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 18520 bytes
font_02_sfnt_off00013a5b.bin
db396d05074a58578da6c3f1fa8f42308cc5cf498e32620a31511df180b9e207
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5B 10660 bytes