Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65de64c71cb330c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 13:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48e9ebac11d17b9f47e272af69119142 SHA-1: 42588f12f34c7777854cf3a323bfad12edefa49a SHA-256: c65de64c71cb330c0281da413b79a3beb8a5616b2c98af29405f354f5a0ebdc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host and redirect to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://irlanc.ru/uplcv?utm_term=pressure+relief+valve+calculation+pdf PDF link annotation
    • https://oteaexpert.fr/cite_imgs/file/7745896275.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pomodujutepakuw.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109b4b78a0da---20603954546.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/xojunok.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c27285c6b---62131459571.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/31427063572.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/31948128257.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/67574979309.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/tonogofojinoko.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/67775762629.pdfIn PDF document text
    • http://symbolfoods.com/files/file///kafuwobejugelabejapiwotek.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/35314087809.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/568984063.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ba350c715478ab121fdbcec3a52c583c/supedevasabelober.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/61621734744.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/6889858125.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tevifurufutururirewe.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/53735712247.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210623041612.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d393f6508fa---xafelugemubenomaku.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/99269211023.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/45330554055.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/psnp0pit9o2f60dl0q4g9ao7c9/basafaj.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/30768609308.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/13531834885.pdfIn PDF document text
    • http://ipllaser.in/uploads/lixowitapodesegokunom.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_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 10780 bytes
SHA-256: efedfefd6e0c3812850f836f9642474628a0d872a0d44e8373051f7b46cb562b
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 16828 bytes
SHA-256: 796ecca7131e6be8a084f59d349f89732c0b678bea4e792e36c29fb880ec5093
font_02_sfnt_off0001271c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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