Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db3aa0acb1c6f33…

MALICIOUS

PDF

87.3 KB Created: 2021-06-25 15:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cbd2c18e0d85b1879670370228b0d17 SHA-1: 621327b6484e4d32795d67ad08e7a20920b26165 SHA-256: 0db3aa0acb1c6f33ab5dd8d78c001ac3c12f6cff9108184d9a9888ee9cbf4a71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the ultimate destination and potentially engage in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://infrive.ru/uplcv?utm_term=i+live+with+a+hoarder
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/53764266991.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca84ac59a1d15081e2b8f3d8c7819d51/66831023192.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e382287e78b80e87e4817124eab1c64c/20933330164.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/34164e351faa9fdc81fcd9badb49db2e/53214982816.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/27007306896.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6cod95jtb2pqjgv7a6ekq4dpb2/rabasosoguxabiwadop.pdf
    • https://narimasu-chintai.net/jcfiles/file/95213048485.pdf
    • http://synowka.pl/galeria/file/48854739085.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/384cfda4ad46a011d5d606aa9bffb3f1/monejopiv.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba6c14b47---34658949558.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a20582378---67192123974.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a83b5b95156---sujozulugudareted.pdf
    • http://gernano.eu/gfx/userfiles/files/polurumimujijo.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/rupitowazutuxaxekizefi.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2rgjjf1v068l0vtrg4s4jmgc68/54939251457.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_off0000f37d.bin
93bb6b98d6817454e5051773f340e76075c8a8291f0dead26cd375c056829885		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 17300 bytes
font_01_sfnt_off0001201d.bin
ce7f813303b98af2e5e2e94bb399b9a4f8721920a2cda6c8ca26fc4bc8531ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 10176 bytes
font_02_sfnt_off0001370e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1370E 16792 bytes

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