Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84d31367d48e7b9…

MALICIOUS

PDF

94.4 KB Created: 2021-07-21 02:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 35f92834f8425e409e68b2b88b64b8a7 SHA-1: fa7bb550bb99ca7556a0a8f10ac888fcf0de93a7 SHA-256: d84d31367d48e7b9be7e42fc1138d8df13f03bd31793eb416a529b3805de4d9b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://digireg.cn/upload/xovurinukolezelumeraj.pdf In PDF document text
    • http://balcimimarlik.com/resimler/files/47501590727.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c8e7b06aa820dc10e486b33cd55d5939/73578437611.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210629093801.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/dedee53e069c582d87d3f6c1a3856a88/86109382660.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08c027d5c---78526165387.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/fupokekuketojetifum.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2dd28901---90921357803.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160948388935b7---matuna.pdfIn PDF document text
    • http://bdn10.cz/files/file/bibajalifovimawibamado.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/6634515037.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/dufaburubadebujalam.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7ovgpcc7m7d0i8tkl77f6btnlo/32262842185.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/30089078530.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c05086d93828d2b04aea4baebc5607ff/kaxikipujinonerulaxiwizo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fbd81a3a---benima.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607956e20bd5e---lorasez.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d180c52b4a---gudebukajarefuwel.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d44fed8c4ab920ed1fb89b6e1d080ab2/jijefazerutor.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/28519778718.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a1089830f0d---6360700369.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ben9kktgtupnhfbooepff71326/suniname.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lcgx+price+guidePDF 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_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12872 17316 bytes
SHA-256: 964d1e1ee6b583fa05760efb0d70873e9f3434fcddac211baac35b9896f86bcd
font_02_sfnt_off00015600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15600 10152 bytes
SHA-256: 5e327cd8c0a726798f19c99d80604211cb4943184e60ff87bdf50a6897faa147

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