Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91bf3ef97f0ff0c…

MALICIOUS

PDF

86.7 KB Created: 2021-08-07 03:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 954631b5963e0aed7a4e84c3be8d2c53 SHA-1: 57d9d647785c6eb2bd89fdf912e82f7ba882c470 SHA-256: f91bf3ef97f0ff0cb74f2d59a6ae037843785a406e54f98a6f0e6409b567f4a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/576c86442d4f0b391c07f85d0cdd858d/rekunuwevaz.pdf In PDF document text
    • http://thedigitalscorecard.com/userfiles/files/netemalotetosiwe.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080124096de3---malafelozolex.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607903cb6e4d0---75422431032.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/roxexivatoburujigilive.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/bazinatabasatazajowo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e79155244fbd49059a97d27d15f21eaa/wemogepogaragedekaze.pdfIn PDF document text
    • https://wildnaturetravel.com/File/4912982052.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/pamovamunutekijexa.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/zedigaba.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e94beb5c9---rowumaduzeg.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/wigujitositarobufamug.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/damedup.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5c7ac1174b6d5ffaa953832cf8577f1c/579419805.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160790e3305e25---94280100389.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/fodox.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ad9devg24h0qqlns7d8jkv1qor/79124822018.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/318aef71c2e73a351436b6520baabd00/58737097560.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e4ecfccd---3891164102.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/35363708398.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/tomoxofokigevimarewom.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/14970836491.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/47021352858.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685594d63d---zinesuneku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pasos+para+hacer+un+goni%C3%B3metroPDF 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_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 18156 bytes
SHA-256: f404f041f9c5d7b888009e9fdcc9358253e1a8b90a774c65c92ba5a73be680ae
font_01_sfnt_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 11016 bytes
SHA-256: bd9fc75d6e84cfd7049dbb294f508e3631bec3d8168fe1043779071c5ca0df97
font_02_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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