Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57798fb390c8d19…

MALICIOUS

PDF

73.5 KB Created: 2021-09-23 04:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dcdc321e9e9c568a6ba09863960757a3 SHA-1: 90b37e1408181be49b76af3cf699a540b28687bc SHA-256: e57798fb390c8d19847594bbcf992774313f94d8b65a1af18dec7027b5924fed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff88d83ebc---67650847077.pdf In PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/mugujapevoxuleterowozati.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/72573353092.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/kotizetidiloget.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lipabidamewi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba8c5b0bc---89062035493.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/gaxavuwaxeronuge.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f70a58470---98451442811.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/mituzed.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/telurujiruzaxudu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/mewofareveraduzaxoxupokis.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/danutuj.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/wudapulosagirisogesim.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/xarevesikututobejaxozo.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/besojuja.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/021731579582.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210913_C6869DA21E8062F0.pdfIn PDF document text
    • http://jonellchem.com/upload/files/gawunujovulopawagu.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/52147308899.pdfIn PDF document text
    • http://screen.by/images/file/fogolima.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gugonuwibosutisasasojoval.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/6962144856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chemical+formula+of+denatured+alcoholPDF 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_off0000bcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFC 16852 bytes
SHA-256: 8df7f1322792b0b9e2dc2438616dc20211fb78c3ff9c01f1a13d3b861f4218c8
font_01_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 10704 bytes
SHA-256: 37cf6ef09cbaaabf30f0f9ecfe6df0030aef0d93c410696e80a88af1f613984e
font_02_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1