Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c7ed1063629dfe…

MALICIOUS

PDF

88.0 KB Created: 2021-08-14 21:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7bab1f93d9fbf56cabb04a4ddd72f7ec SHA-1: 9359b6bb7304d9f91eeaf3658fbc38f57190cd39 SHA-256: 89c7ed1063629dfe39d86ea1b7474bf83e92c2f1f9046a554f2b2d3a9eb862ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=project+completion+certificate+sample+letter PDF link annotation
    • http://noithatdangcap.vn/app/webroot/uploads/files/29936342619.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b3a4cdaafb3ad28350b13ccd11fcfdea/jurizutudiro.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/minetufigaretakemufal.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2daeb2b2ac---7051771541.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b35efc17fd7f6be99fccca714c78c172/kewanabokaloxozeruve.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cfbd649bb42a5fba29fb244ae5c34abb/72259749114.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/masokegufukururakarukopek.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8a7524de---dusalu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/pozufagijepejegaga.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/kafegoru.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6b06d332f---96295656309.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/80585265396.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/78427243074.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6adca202b---rapatexuv.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/21646633203.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/bupowigefif.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b499e7b84a---muselulidutezupikeviwim.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/kufisiwuxizibusexi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090aa7706ded---rogok.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/doxalex.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f2cb20078---goturo.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a02413fdf---97579158111.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/vivuno.pdfIn PDF document text
    • 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_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 10772 bytes
SHA-256: c359b108ed90aa005bd0fc525f2af733b1b4a0197eb1c37d9ef10732df1d3a1d
font_02_sfnt_off00012495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 17464 bytes
SHA-256: d229b384de3fec78364f1ac1eda3588dbcfb05f7ed74647250a32086aa7772ef

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