Malicious PDF — malware analysis report

Static analysis result for SHA-256 274b367ee868095b…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 14:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc156de0890712d6a174ac13455b6c62 SHA-1: b1d3cfb84d06013c83db93d230443fc78f9b3576 SHA-256: 274b367ee868095b8c64996447ebf8ca7fe54dfe7a3a1dbdfcf0660f23ec1fd4
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to potentially compromised websites and exhibits characteristics of a link farm. Crucially, it includes a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for executing malicious code. The presence of these elements strongly suggests an attempt to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://synerhu.ru/uplcv?utm_term=3+tier+system+architecture
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce54b6af5---95158000094.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfaa70e466---64265574882.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3f690349d---21107245075.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/d55abfc9dfaaeab1d79142b708368493/fovamagupopisate.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/1905e9f29e2eb488f98a0614433c2a88/45794343985.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81d470338---56618578291.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/11719249319.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/aa5fd1896f0f0ccd021f8554ae28a60f/jagexakigab.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/glkpac6g3g11k180g0qp0v5gt3/11361855013.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725bd1a7194---42375446469.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f673c1e671---lorulezekoxinus.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ef693e58---mobofasukanux.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/93135842135.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/l99o29kvh49siu2966gvo2igf1/39499723668.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/2033658297.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a516163b9d4---95387190228.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16ba26550---99558238892.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160892b8835d77---wepupitusalosowozi.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/dd08e4ac422c70258426b48b8e42279c/7841415846.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795c5ae1190---53548808217.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a286bc98cbc---mixixarewurapomikoxigopit.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_off0000f06f.bin
084c1764eb812b42f559b1621566be5ec60d54d953cb262c54e489f6e5d8d18b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 17780 bytes
font_01_sfnt_off00011f83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 16792 bytes
font_02_sfnt_off0001379a.bin
bf71edc4e19eac37f6a4154719857401c2aabeea4d0028c0af338b68dd8aa72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 10516 bytes

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