Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb91e8e8acef078b…

MALICIOUS

PDF

81.8 KB Created: 2021-08-15 03:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: e12ee9a405961488c37f4a5d2c8c4285 SHA-1: 25bcc0509e6d85d97060cb96c3a2ef18e4009d47 SHA-256: cb91e8e8acef078ba380265db39eaffe0dd7512f3800f9e82217e7ec587a1954
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=clave+de+producto+para+office+2016+plus PDF link annotation
    • http://auchli-appenzeller.ch/userfiles/files/lakamilefexokofufawubero.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/88147248580.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/26637269067.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/65639890661.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/81645736723.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d41e9b84---kuvoje.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/32866654830.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/guzedotibofizefufe.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jusek.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ec7fb06430a2a4d6d4eab4eddb9a5508/27154521677.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/ragefip.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/ronufajava.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/ribujuxurogadiwadugu.pdfIn PDF document text
    • http://eternoohydro.com/d/files/furaxutovopepid.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/69035848445.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/gedifemofubenosi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083988e0c9c1---fakunopupi.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/wafovi.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3436a14eceb1b5e462c2dd6c98e29e6/dufufusenijenepogono.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/movekejadajusixowetexi.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/wemasuxisizagufebaremadud.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac3f74e6d---9959066114.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ac6c2c8201fcfd362c65ea0881a52594/kozilebalo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 17932 bytes
SHA-256: 4570d3a236f65b179bed0dbb7a84ee3939247c75342af1cbc4060f9335da5f7f
font_02_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 11168 bytes
SHA-256: e81de61180f4e95899e3ef898730a3e5404b494a0c2f0d38bc8ac8794ce87aa2

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