Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd65d9215569d90b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 22:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 604d24c581ff08249e46d89f9d9b5d72 SHA-1: b5360e7439b3fe92e0edc97df58b06c84b64ff86 SHA-256: dd65d9215569d90b601a648f0e877aa59b4c09e78301a357b4caee752ed39eee
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to various PDF files suggests an attempt to redirect users to malicious sites or download further payloads. The heuristics indicate the document is designed as a lure, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=manganelo+app+apk PDF link annotation
    • http://ytlcases.com/userfiles/file/62724974027.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/17236296534.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/8222319263.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/37378845258.pdfIn PDF document text
    • http://dentistturkey.com/image/files/xoxutigore.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/xitujoxarunolajuto.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/tesemabezufi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136b696a73b6---gafomudiwamobipowinub.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78a79addf---pafusokuz.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/31099606481.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/87888838864.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109040728158183.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/59639026683.pdfIn PDF document text
    • http://decorstore.eu/upload/file/79340557926.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/nedotivef.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/489c7fe2da4b9914a4f4360dee220e73/239852505.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/48695490714.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/81035759824.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/vupazoloniko.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f625065f73---83026137476.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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 10052 bytes
SHA-256: bdf16596f962d98613b98a040758745c14a2276c7bdd878c9f5990101c164e9e
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 19144 bytes
SHA-256: 6086ce4c66dc4b026b601724504553d294af145136304e107c799a526a6b482b

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