Malicious PDF — malware analysis report

Static analysis result for SHA-256 577a0afc1feb4185…

MALICIOUS

PDF

116.0 KB Created: 2021-06-28 03:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 911d3ad59638dd321e9ecf53374e49e4 SHA-1: fdd207f41e6d01cef48d967dca8ad7b10c117412 SHA-256: 577a0afc1feb4185548bbfabd2790e98c551104dfb64122f165eaa192aac4655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic indicate a probable phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b777d426d60---40103239120.pdf In PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/32010147902.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80fa69310---98790288602.pdfIn PDF document text
    • http://dentherapia.hu/files/file/tenoxiwuzoxafovidumavonir.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/76392175044.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ebb42cafb225bbe12725065e0da83bc5/juxaneru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a840c8434a7---20880536152.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/vowifazozigedigirimubu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0cc874b9ef50e8436070ef1a38df48ab/satosowagox.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/43728943774.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23919a0674---nijubebonozukazat.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e13df4f6d53e0b275c0e6a79a8ecfcf3/dobapusomako.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/95389476427.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0581713001619940630.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f75eq5l6v003mg5kaamg73j7il/75118165789.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099950515620---86779270771.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/2814212768.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/rabuzisin.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/nojevovabelu.pdfIn PDF document text
    • http://prestopc.it/upload/file/gitulukonigevaroxaxixega.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969432a7c2c---denamibe.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1f8b7e8c2a1dabe57f838eca22a7e67b/liwudimugakex.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a817eb18d97---josapifilabe.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/016b9c6fe4b1745f51f65b2f0d500b56/patusud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=probability+of+mean+in+normal+distributionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A3 21132 bytes
SHA-256: 218a335f5960d10655d81108be23048bcb6a6909fb411dadd549caf1eb136ad7
font_01_sfnt_off00017b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19373 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_03_sfnt_off0001a8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8A0 10872 bytes
SHA-256: f62b6a30cd499869c848bc3ed9bd8b5bbd1feb2c97e32ba5333e33403b5f0f82

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