Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c68bff1dc6d172…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 13:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8d3a8753dc5033861985c9df507af8a SHA-1: 5860a31b3132565f4a159c08bf690c7a732a0270 SHA-256: c8c68bff1dc6d1729c98005eba4a450346e259512dbda55bcbb7ee598ec4c6e0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious commands. Several URLs pointing to potentially compromised or disposable hosting were extracted, suggesting a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://cariboohose.com/userfiles/file/17646775970.pdf In PDF document text
    • https://thefertilizergranulator.com/d/files/zoberogapawotis.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/38181291135.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/19373527076.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129434a83f45---vuvugetulodekimamefir.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cda9fcec---10955504134.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160be157877d73---63518078211.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/49773953421.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607df08cab874---balexixikowefap.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e91b34c1e6---sikivumeseletidi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/63686220039.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a746ecedf0d---manumeladev.pdfIn PDF document text
    • https://masihpt2.com/contents//files/27383487642.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a009a1e23---10067936590.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/xunofarokogujewidogesog.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210716141419_i1oyu4.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612bfb3f69693---17932342017.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86815866019.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/90423204052.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd916f30f5---dumefuj.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/20190440824.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/mimofutejoruzizokejajiru.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/gajugu.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/53198925178.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ab63c39c---1650599118.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/b60a3eb7d42223da18e645f0b0a070b9.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+combine+multiple+images+into+one+pdf+filePDF 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_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 17524 bytes
SHA-256: 23a20b6361ca8d58cd6bf7dd35d4df5a07c28d7c228f91553a9ed9bcbc2444f6
font_02_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 11180 bytes
SHA-256: 1f432a7dc8bfaf5a3e61fe82af47c0faf3523e2ea73f12a54d6d227c69523cc3

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