Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a010d8a3b12101…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 22:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee0bfa38a5549581002581d4e8332e19 SHA-1: 7afe3229737e4a8e9c5cdaf564bbe014ba33da0b SHA-256: 87a010d8a3b12101066f2b5020456d56b5ab0bd23b2ea87e4528d09549a7b729
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://fairway.cc/images/blog/file/vulalunafukipawebisawubi.pdf In PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/91139145703.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/lonamezifiwaroxabuliwuboz.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jirulajafedupubu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f12c798b8b44e2ee5085f7a253e4ce97/korofazidonikidewafifadol.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/31507388076.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/2694513530.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/97223914496.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b77964cad---31263149320.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf3f4aebb---53867567902.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/kurivadixefexilidanalox.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/75053061803.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/bulibisozoje.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/zuzabepavadexo.pdfIn PDF document text
    • http://emaaravm.net/upload/files/zaboje.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ca596b12aecc374ac7a3b38f2fb7ff8a/juvaramobajitate.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/56680257260.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/xisivogodux.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7b5fe7d3d586f3c1cd98226c8abcd6e7/52881684292.pdfIn PDF document text
    • http://goldia.cz/data/file/94647213342.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/62923227162.pdfIn PDF document text
    • http://unsersohn.com/images/file/79028919445.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/74803022767.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/vixofajoninugodiraf.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/zimegarame.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/zidufodaroxozinirofuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+close+all+apps+except+onePDF link annotation
    • https://easyown.ddproperty.com/datas/files/wirilifodilop.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_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10592 bytes
SHA-256: 968d75709c6f56b3717b322e1e169ad65bf8546a26dfd750badc2a747129431c
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 17224 bytes
SHA-256: 3eb13e71027f83c05725bd52b606ef45cff5cb61188eb0a3e46a45b1e6445529
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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