Malicious PDF — malware analysis report

Static analysis result for SHA-256 338949ddf8a573c1…

MALICIOUS

PDF

99.3 KB Created: 2021-08-17 04:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8df029d0fa99d57a8d621043f4706624 SHA-1: 492710384f5fc1600955996f4c628fbe5c96db73 SHA-256: 338949ddf8a573c1ab616749b1fdcbe3451715e1c79e640762ff5ad4a42d3892
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used to redirect users to malicious content. The presence of external URI firings and the compromised CMS upload link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd2aaa95de---48421382154.pdf In PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/vatigoruwekigabidober.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//42435099998.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785532d77f9---duzuworakerodikewobovuw.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767aec2a045---lagixarovenoruti.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/30fd05a5cf1f03f4f57a8bdd3fec2bf4/xojenivuredirosesobis.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/v300q0t5htrrtm8upku6e4iso0/28242302258.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/hrknp5vmldpjs46rc67ri2hs63/basovetivadanomezawusazij.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/31388843145.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32325ca55---wefumazumisetojaroramego.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/dimowakume.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/8048576651.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/manepajitonipipoxunije.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/e1qrastnkvs6bbrdpns6ddojg3/43004082961.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/terukifiloba.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/o8vlc6ferca708os6caqdb7kur/35001115184.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bk0no1em35i3cjan3r16frgaq0/renomepikupagaxo.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/mevotokagulegelagejemip.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jugawowuwam.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/lajepewiv.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100721ea1ef4---pumexefuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=maths+olympiad+contest+problems+pdfPDF 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_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 20304 bytes
SHA-256: bdd3b4c2ae844b86c3b10a74cce0c68682ee9fc9a9e500cdfffd322fd5d1507c
font_01_sfnt_off00014d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16528 11132 bytes
SHA-256: 1d48d9443e967dce7fb66bc0eba886943d405f43cfb6caf3bbb0d0e1cdc7089c

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