Malicious PDF — malware analysis report

Static analysis result for SHA-256 236becdd8837f968…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 08:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 18affdf9a546960abf43c587952497eb SHA-1: 9a77eb656f30beb6569b2ea4c4f4103b7fe16e24 SHA-256: 236becdd8837f968c1364d6c34eaba85c38d4d209a355502d7c0d75fbdbb02f6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or download further stages. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a88a1b800---mibokekepetumuginofaxezu.pdf In PDF document text
    • http://jtour.vn/userfiles/file/gesofedugixozoxur.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633bf365f6---4201809428.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/64500049209.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021621231497201.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/novk2ljrfsj78mpit97ni7hduc/80340286725.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/52bc1c78ea797fcb04a711260aa507bf/zeserutu.pdfIn PDF document text
    • http://1careglobal.com/upload/files/38991709128.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963af743777---2848359589.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c788816dc6d---40008297644.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qo6u12nskl7g1376npo2d30pmo/gogilujevoxubuwisedoga.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789843c7085---roxazeferumevo.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/porejebamubewifog.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/vupumiraduzuvi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e5d4d841d---74973385555.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a7bc6a642f7af8e983deb0ad1a304489/kavuwa.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/paxute.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e29e63d83008faba9f9edbdd3b714809/toriredogedisudanis.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/526ff8912505f7b97e65ffc6b87cc8df/38288559477.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/84e4a63cae5327b6e9f4cc484207a3e6/bunowavetijobak.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/44462041129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cooking+madness+download+apkPDF 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_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 10748 bytes
SHA-256: 884e7cedacbfcda6e16254b067ab138ed7074cac0efbac4e55abc16103f7f406
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 18556 bytes
SHA-256: 40b6db39eed39b13c2eb0ea918ab3f2bae75445bf9be5219ee38f4df7a0c604c

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