Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e7768060ab6015…

MALICIOUS

PDF

94.7 KB Created: 2021-08-31 19:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fccaf88a59319b1c1b9edd6370f1992 SHA-1: 6bbd7c05f68f6fff064f56d8953e16a117074910 SHA-256: c3e7768060ab601535cb0b152c8982c579e4e96ab8376092d6c7cdf544abb89e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/54516293107.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/eaf1f2db3599b58bc6af67b3676c610c/dikeravek.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27be91e05---xiwubobubifobopowudut.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9ec2001feca70095d6acc60acbee32c6/xibemelemutewonog.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/vuwomadamirusatix.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/42315108635.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832556627e9---15783720929.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2221375589---91622502093.pdfIn PDF document text
    • http://jadeite.ru/images/file/tevamidoba.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/48385387779.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16291341395754.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34b36d59c---jilujo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/lmabcfbpbbp1fb1q91qafgu543/wazavilunuva.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a706548c185095e29bb3a41d57f02f31/79225865010.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/zimodidan.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefc92e1ba---49437491261.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c0c0df1d9526f891b76bc2972b5fd14/madoto.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/06b4c36290c437d031cf4e4e12bfde64/nazinibewodexokoro.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ec01920e---20773105803.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4879e6cafef510e3653d8a845c4be449/pometojalex.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/majivunagujababufigupum.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/roxekipawegunozuxobif.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160852f63b995d---fogedefojemidemon.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/sojegurijutoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=are+resumes+in+past+tensePDF 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_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 17784 bytes
SHA-256: 53181f4135cb6406b6cd4dd0e38356ab4dff7b9b97b75dd615e4c3a6b8d86f7d
font_01_sfnt_off00013cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAB 10328 bytes
SHA-256: b861e5a96967159f8f27f0928eff3b194f777a7d7a7849ab07a48c452e6c9c8b
font_02_sfnt_off000153fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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