Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cef3b892032ee5…

MALICIOUS

PDF

92.0 KB Created: 2021-06-28 05:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d54d68723d7cf99b80a69ca688db6777 SHA-1: f3af54b2a24da8dac7a4adf884a79c385d84909b SHA-256: 86cef3b892032ee5196b2e16b2cb0ab25fe8bdd0bb7c0682172e183e817c12b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress sites. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination. The presence of multiple URLs hosted on various domains, many of which appear to be part of a link farm, suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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 https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5075de02---fugezipuxumixilelepabomu.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/327133b137dbaa607a64a06e44b762f2/wazevotabil.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/26l0kij76m8iipd5jqm8rur1s2/26581410819.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/da093d2f4a9951e7d76da430b921c4de/pijowo.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/c4c86e7a356e7ee71ab6cdb340d2307a/81082658339.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/90a677b03fdf61b51a1dca0b3db38e07/sevabasugorodad.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/domedenememivufanegasozug.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/jikasuv.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/32646937205.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/606bf73183e6d2368a88cd370709835a/36985486676.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2081fb68d0---bijiturumipamelilukonuli.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ca41302a322e5d046455dd25380c5ec6/rerifikiwaf.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160959a42a8e25---24605873828.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/joxeramar.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/93a967db2b66ffe2232ccf139e5ed6cd/karososokezutuloxu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f2e53ee6ff1009ef66ddb2e09c723a44/91727133725.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/40154167446.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc5956b9578517210e6978fea8350b99/16660927392.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/nesusexo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/verobuwutifaruwamanon.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fe5g2hta91ngkp1h9v6ifhu6ap/lavikuweduzudameto.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c1f25d76d511337aadb07dac6373f3a2/somurifaxopapeses.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ba3ec03c---70560876935.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/64c0b47b018c873128adae1660c1c236/rojapatidesevuboluju.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/9365682013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fifty+shades+freed+christian%27s+perspective+online+freePDF 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_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 18084 bytes
SHA-256: 50a51a68183d15cd0b51d645046488940fe1c22f348ed7e0792a4ec2c91450e3
font_02_sfnt_off000148d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D6 10908 bytes
SHA-256: 4fe01867ce5394de07670fcf6cb8027f71d1e6e8f3fe8bca5f898179e50cf01f

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