Malicious PDF — malware analysis report

Static analysis result for SHA-256 3607eaba72a15165…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 20:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ceb4a6620cd63adbf59f34f356b862ed SHA-1: 83ff6ea9dc19b4c9c94cfd1dadc934ca6c13d9ae SHA-256: 3607eaba72a15165a669389a0ae4722ac486c1c6a2dbc0893a5b1c2da92e4faa
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/kukc049o3l9np6u7lsuk6q49l0/77214045410.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rukufixorasejuxizav.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/6326941898.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0623270f91eb562358fbc754aa875b55/rofitasanu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160804341ef047---49742698739.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c605bd4bc---vasumulovugipis.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/9952658577.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/26055402941.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/77787904940.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/rg83dojgjgnid62hnh8oin5tt1/40166198694.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/80726984927.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/lafefalojo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/gexedozipez.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/38993227513.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3690b7f9---nekoposeribine.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/suwinosusudezavoli.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfed4a5d70---37167451046.pdfIn PDF document text
    • http://envigest.cz/upload/file/6129566.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/j0t0gfgvcucft5g6886u0jqrf4/3049942667.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/579b7e3ca9ae614155a506492c35f30c/16405102884.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b35d91a87a4e78a46f0e430a8b8d7f7d/zegutukipizironu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/49447217120.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/niwegujumuxakuxotakipo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d43ec075---1526726688.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5p40pugtgeh81sasv32ld53vd6/dikun.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/jidaxijosal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pronoun+exercises+with+answers+pdfPDF 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_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 17556 bytes
SHA-256: 96b17cb9584740acd432f9897238a44a19c2627a0833e85d81a6e8e989ae2754
font_01_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 10960 bytes
SHA-256: 3511a970e362b6039bfbcaf92350343376615d50bb0a13827430a1bfa8179095