Malicious PDF — malware analysis report

Static analysis result for SHA-256 5373f452827e46af…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 03:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7fff8d7794455e5c1ae067832c5a8b71 SHA-1: 7b901080a515974fe1f9f59a870dbd6e97c0b13b SHA-256: 5373f452827e46afb2df453f3b639a3387b6b5c74a89ee7cf2d1ed52c7060de7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social-engineering lure to trick users into installing browser extensions or updates. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=idm+extension+not+working+in+chrome PDF link annotation
    • http://fueandhair.com/userfiles/files/42046892924.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/72824777500.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/66236891254.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/31135387538.pdfIn PDF document text
    • http://rayanchem.com/d/files/mubavuxoriboleja.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/19675774173.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079477cb798d---77096282410.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/korilenuxeloko.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f276cb173ea---ridasixarufamobekovagu.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/nigiwomisotubexawadi.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/22212610198.pdfIn PDF document text
    • http://myqself.com/upload/files/73793438556.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/7slniugkbvnfdfpfhlfsto58e3/muwavez.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/bagiwofi.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/41028379027.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/jamuwofukitezofojosaz.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/bopupukonufetodute.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/vaxituzelumanuwuzokenutow.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/69763010993.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/xupufuf.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/kupisowirokanoleb.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kidefu.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/mkrokht6qav6nc0kvqqq54qr2k/14255349742.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd43d8ce9c---pafowibopin.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_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 18028 bytes
SHA-256: 60fa15879efbd377ae320e084ec065f4611a20a6f82e17c775f6ecd15b39c32a
font_02_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 10840 bytes
SHA-256: a6e52ba23a8517cda6764e49df3e787766ff93bb28f06f7db4d89279e896884a

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