Malicious PDF — malware analysis report

Static analysis result for SHA-256 84122231b9a623e9…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 12:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52444e1e5d0351f56ee96038285a0ec8 SHA-1: 2ef32f998d10026c12530c02d1f77fba04377128 SHA-256: 84122231b9a623e9e66f151fda593967ddcec5c5193f83856768a7bc7650ce56
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The ML classifier also strongly suggests malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614cda7a72af6---wikebivalekerilup.pdf In PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/78157768456.pdfIn PDF document text
    • http://videocycling.info/files/file/97751625051.pdfIn PDF document text
    • http://esistore.de/userfiles/file/xadudogixefufodama.pdfIn PDF document text
    • http://net-marketing.hu/images/files/jikej.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/49174215290.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d79ec893a---53495777628.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/ritil.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/simuwutilemegerawilekuseg.pdfIn PDF document text
    • http://premo.at/userfiles/file/71570192266.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/22133126175.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210918210743_cecvje.pdfIn PDF document text
    • http://446888.top/userfiles/file/65830168124.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210911012134591992021.pdfIn PDF document text
    • https://pepsima.biz/files/file/palagipaj.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/95843189445.pdfIn PDF document text
    • https://linardi.ru/files/file/97026657980.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/fuwavujofeli.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090711335870554.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/wisekoxebifi.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/25460602420.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o6e3ueta7rh7q3t05e6p7hvk85/renoda.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/24427510329.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/winexoxopavuvewe.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/rataminarulisisipe.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/80614806258.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/folupetadavuvalixelolora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=augmented+faces+androidPDF 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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 18472 bytes
SHA-256: b57505d909c8937025a360c8ffe163bc1e516ce63b07d4756ea4a7b1ac8a8e5f
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 10852 bytes
SHA-256: 05cf4e3a171444294f437a5306b3b22fab611f49c7832148b1d05a8040eb0c51

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