Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf26120be2668be…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 11:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 128cbe2381b642ed50e57036af50f216 SHA-1: 8aaca9da9b0183739b057afa7b0acaac8c9a3bcc SHA-256: daf26120be2668be5c4c5807bee5eebb1c8f7923d5ce7e6de0fd8031015fdc63
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of a 'download button' lure further supports a phishing or scam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://duetsepolno.pl/userfiles/file/luxoluduwirubuwizuju.pdf In PDF document text
    • http://ahkkpcm.org/userfiles/tiluzetuzuz.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210617224416.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/46810504598.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/32b2feb570dd8b0196351b106590b30c/nisoleluzewovejolazeleb.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1610b656415243---rowikezukaluwivuvuraw.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb3a3f703---vubavuvixujozurika.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6e41936f76cee8f32881aaec2b85da18/50983220849.pdfIn PDF document text
    • https://tcremich.lu/files/files/wowowukajesoropimuri.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/81216771277.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6a41ef8a8199b2c7dee3eb525d7d2005/vamaf.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///44350773380.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/rv139k657s6lo9iqgu5orq9ll4/18097253932.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f23e146542fef2524180a85569f1495f/66274978034.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73a6f3f67---43347262545.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c88c4e80bbeeaf5444b1d01a5726cb89/zukuritixugixokew.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/romaxewevesupakefe.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b93826776d2---28340117333.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/zovufafobemuguxefugufup.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/22ae5ba44981d54ca68f14922885d8c5/15143839469.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/888kv5p43sc3216gstaepa1urm/zemugepuxorome.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/71f6acb51b607b675bc441d5a96f636f/zojuwunitowe.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161255248debd5---rukobamozazituzoza.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/ce8f2caa54248b696070ef1c3870e47f/88557574696.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fd286bb15f20ba38cf11a238e892a475/77779826405.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/zuneniwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ncert+books+for+class+9+physics+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_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 11104 bytes
SHA-256: 5b40aac83fe02197af5219b5e55f902350be1d2c7b44484ad4e8a65213ef8feb
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 17792 bytes
SHA-256: 1015fd921484f41c74a58ea6cce0bb7d0aabdcc8989aa0cc6d262ffea7cf6ad4

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