Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66a3299677ec656…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 03:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db0e06e4830d179288dd73d585a1896d SHA-1: 39aefcafb0a70dcae9eb7cc05c17a3bd77b23ea1 SHA-256: a66a3299677ec6562153a5abcbcd6cec3266bc17ee824f46cf33bbc20130afb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. These links likely serve as a lure to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/df0bbacde62abf1d89293057ad342ada/vemiteposuxap.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce6e4b298---6396766441.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0797efd87---repitamomujapivofegex.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/spofg0qmdr1si6shouefu8322a/84372865504.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/mivobezoxinamipofopidexu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7a725540b59a289599e86a376d3802f3/82448223863.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/zepivejolage.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f6e87f2b---7231477482.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/sibaloto.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608389c1c5bff---fapanujex.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b87fc91daa6---nulexasuvukakasamakov.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/22578656807.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/tudizakugemezoki.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/sawogumemopesujukatage.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6dfe30bca840af30c2537c21730ef175/fejefugunoruxuwekuxaj.pdfIn PDF document text
    • https://auto826.com/uploads/files/7997737901.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d801fcabe22cf88cbd4ac85debeb72c8/8552506624.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/dexamexinitaguda.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/rutmmdf135vtqhtjnvemvb6mdi/46418030322.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/visejedutixibegoximowi.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/wigosed.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/82160098327.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/29191731231.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/22239078384.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/kajexuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tag+questions+esl+worksheetPDF 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_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 10776 bytes
SHA-256: 17c15c7713f9ac444c07441323cf5d1e7e34d6e0a9ab02765d4c101f80c77b83
font_01_sfnt_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 17352 bytes
SHA-256: 35e17fe3e7e92ffa2657f683d8e30a95a0361ed61162e58c3426c8ce127c5cbb