Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe672d95d0b09d0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 15:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6908ebab426d9ddf36bf08765d589d5c SHA-1: 8f55e1e3e240b793f1c07fbea2116e514120a6fd SHA-256: afe672d95d0b09d035cc0b96f65d1dc4efe74ec468fed45d94790efbb129011a
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 presence of embedded JavaScript and numerous external links, including those hosted on compromised WordPress sites, suggests it's designed to redirect users to malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is a link farm intended for SEO manipulation or to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://realfootball.gr/userfiles/file/1968575799.pdf In PDF document text
    • https://officialbacknumber.org/editor_up/girazadefir.pdfIn PDF document text
    • http://only-svet.ru/upload/files/wamifif.pdfIn PDF document text
    • https://unaizahic.com/Files/files/pamolidonefulefaguxu.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/mebopurawugoke.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/97292429298.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefizidimitebu.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/xovasafowujulefomin.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/jogoxele.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161350267946c8---josazek.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131679738548---69206175737.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/49711633086.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/41305152496.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/7633660463.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/88341225620.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/xubupavotogajifemik.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/41215385768.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/43565470512.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/32649145637.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613717db1b9ab---giwizimes.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/83128004226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+10+gigabit+ethernetPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/zijulegugax.pdfIn PDF document text
    • 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_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 17852 bytes
SHA-256: 3c5d9432dcb5f40f39ca68fa87cd9e5c76818893c2a43f3757beb5f164f65665
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 10528 bytes
SHA-256: 72c79fd9b63167b8bcdf4f3ef422976c4e8ca6926d660dfcf8c39c0aed2c4914

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