Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b43bf5e2e25f9f5…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 08:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea63639b721f8fc2cf8a094bce985f34 SHA-1: 3ae6bf04b61d0b2f297a8fbb2f3622cc7d370fb4 SHA-256: 2b43bf5e2e25f9f5525e829599a83db6703fb05a8d2a136fd51c3eb22d460b37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to execute malicious actions or redirect users. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/7a7462dae244a0a9aa6f365ecd41fd7b/63835852466.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16079d729a46bc---wodesusesixidusodoj.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f77c5b1c7---fexewirar.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/17686784950.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9faaf6da167ef10a4263483b46b57501/mudawijumuxawib.pdf
    • https://activepymes.com/pub/file/kepozemagibisaza.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076762e69577---dejopowujik.pdf
    • http://oreade-breche.fr/userfiles/file/wedaxusibinodu.pdf
    • https://eyetracking.pl/userfiles/file/xolanufefukifamebaran.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/kitapuse.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/7efd5ab683e38dffe8986eeb7b5b5968/ruxoregesaxapebexagox.pdf
    • https://burgas-remonti.com/userfiles/file/95140738739.pdf
    • http://jkbprivateiti.com/userfiles/file/mukonakebefikotosogim.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8859beb6a8651c6ec9961b97be1366af/36761676062.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87876e8add---dusabegekedigil.pdf
    • http://aeronautike.com/userfiles/file/figot.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k8qc2es5aq7bok5m0pe3tg58k3/tarakij.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fcca2c16a8d0253c2d85d96502a4a037/42546851455.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c70e03356---takivekefikusiduvufimiti.pdf
    • https://charterboatdeliverance.com/uploads/files/kawatitanib.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=large+span+of+control
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e377.bin
73199d0e06853da44b3e004c16b7b88289030b32a4d551bfda5bfa60505bc922
pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 16916 bytes
font_01_sfnt_off00010f7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 16792 bytes
font_02_sfnt_off00012792.bin
c06683bd077e47531f7fd836982dc064ac9dbc8033f2c602c883db9571b8347a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 10520 bytes