Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd669fc50901b9c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 11:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 032f99dc7791d08533d3dcd5ce8a7330 SHA-1: 99e1975edfbe3a67912741605040e87f63be1a3e SHA-256: 3bd669fc50901b9c784b3fe438512eeefc6d2ac75459550c34104536a05385dd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were directly extracted, the embedded URLs and the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chcial.ru/uplcv?utm_term=location+guard+apk PDF link annotation
    • http://windmill-bv.com/userfiles/files/8889994031.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/92c3ca2106e169fdf6c70a443dcd06a3/goleluzibige.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/regexiv.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/nepaf.pdfIn PDF document text
    • https://everestart.com/images/stories/file/30267964835.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/gozeno.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/26686998296.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/jufeniguzefumaro.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/jimujutifomuruduxo.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/girepepepipijep.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/rukumazij.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/45863976394.pdfIn PDF document text
    • http://alkanboya.com/files/file///43755223509.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/64753180654.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161301a6d5a710---42757378124.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/91696501467.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/58476378547.pdfIn PDF document text
    • http://dmkert.hu/files/file/74864455240.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161303a4a8f6d9---ruriwiwudebenikoro.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/25224487877.pdfIn PDF document text
    • http://parateam.cz/file/lofajegubebeniw.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/vutapetuju.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/ludusegazolesavepavanem.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/61920235933.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_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 18440 bytes
SHA-256: ccc0cc90632e59ed0435bafbf346d4b943ed8713cef60e80535803d23a9d37f8
font_01_sfnt_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 10492 bytes
SHA-256: 245f11b9c0d470ace98000b6abd83a443f005a8e99c00d7774e5a37684f39eff
font_02_sfnt_off00012d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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