Malicious PDF — malware analysis report

Static analysis result for SHA-256 b758915a6c15ed3c…

MALICIOUS

PDF

96.5 KB Created: 2021-06-29 11:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1edd52db27d5f2cef7bceddc10d8125 SHA-1: 74645d4afeb366b1838f9e44aa8c3481bec0fa47 SHA-256: b758915a6c15ed3c0423c99806664b6e077132d3a59fba945eb240c7593da077
196 Risk Score

Malware Insights

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

The sample is a PDF that contains numerous links to external websites, many of which appear to be compromised or disposable hosting. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a command-line interface. This is a common technique to trick users into executing malicious commands, likely to download and run a second-stage payload. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://ahchala.com/img/file/pixunozak.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9774k6hrh0rnl97lc886vqg372/wipenorosexilaxor.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6421a49a6d45295ea45e642b0f77d7c5/supotitopejufaf.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641db0ad32---26230139095.pdf
    • http://classicalgardenornaments.com/uplds/file/makusilom.pdf
    • http://cityclick.it/userfiles/files/40087266288.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8bec81c1642ca5e6edd99580ab5c98d1/nizuvuxorijikotusoxu.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041e039000---belitanenetejuwivi.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e5f805eabbb4e8022733ec6f6df1d548/85005610958.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092deb7cd5a4---57009134935.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a398c536e04---megog.pdf
    • http://archi1919.com/smlclub-files/file/sowojejajixosulu.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967da74175b---wepebovilojatewapirera.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb669d549---nobebokoxugisotesivo.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/5e70e49e55a17dc3bde68539721384c5/12728111374.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4019b639---rivikavekotageju.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7cb5c62b7---pepaxovo.pdf
    • https://hijaulumut.com/contents//files/75108645575.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2fcb03e81---tomanonanotabujul.pdf
    • http://amandatravel.com/userfiles/file/lamexenu.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca82d02227---63983570537.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdbbc0837---2592499500.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30653b51c---jozitejebumake.pdf
    • https://nestaerospace.com/uploads/file/natizologadi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+highlight+everything+on+mac
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe67.bin
c4b0e453744572d5434c980f76b31a83e05319c8fbfb493a1a8d11847cb83c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 10768 bytes
font_01_sfnt_off00011704.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 16792 bytes
font_02_sfnt_off00012f16.bin
d3544d6c4c669394c814982519b12fc9d22653c1f64a40ff17fbeadf7fe595bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 18220 bytes
font_03_sfnt_off00015ed3.bin
c23a78767c17a1614fb89d96e2d4a0bb3f466bbc82d371f47e982e9626fb525c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED3 16084 bytes

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