Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c96b725facd2b5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 03:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e76b9de2c79e7c31ad72184e44e8a2f SHA-1: 3451ebd41600ccd789aa219b5ff959f40d3e3380 SHA-256: 53c96b725facd2b5df860a8e40eabfb08a9cbed85a2b532b36076dda09860303
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and ML classifiers. It functions as a link farm, directing users to multiple compromised or suspicious websites, indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://davnosti.ru/upload/fosugafunabebigofiwij.pdf In PDF document text
    • http://ibb-online.ru/f/file/sepanomo.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/suvovudapigojonilinisaw.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/084frkj8ppgc5gp9v0aqefr8ds/pumageni.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/73370483579.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/wipakumiwejuvijijif.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/5560144212.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/79991718733.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/dawaj.pdfIn PDF document text
    • https://bselink.com/userfiles/file/97482651937.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91354ffb7---58467214758.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210919071248.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93856076660.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/77842747770.pdfIn PDF document text
    • https://phoneeucom.zabolekarburgas.com/userfiles/file/zakanijibaxejigizez.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/2321338014.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/5029944475.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/88310564674.pdfIn macro / runtime command snippet
    • http://vektor-bezpeki.com/userfiles/files/23712306134.pdfIn macro / runtime command snippet
    • http://timnhanhonline.net/upload/files/zopeverovigunesugujajez.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109051421006291.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/69606438330.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7533c45f5a6fdef2915f9dee2cf5a850/65733184744.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/vesokaji.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/lerobejobimafexiz.pdfIn PDF document text
    • http://exito-opakowaniaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=friends+tamil+movie+with+english+subtitlesPDF 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_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 11064 bytes
SHA-256: eb093060acf34e1179349e7863681def079e5ad4fe8a5343f5e6a64ce2e74e2f
font_02_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 17328 bytes
SHA-256: 9b1c2f4ff2ea627c1deb19d36cc6d1751d8b8c47f8773c2396f18cf77a9c2dce

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