Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd5a4e3dff70043…

MALICIOUS

PDF

71.3 KB Created: 2021-06-02 05:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9cee375f9cb10b02ef90b335e3fcba17 SHA-1: 08af916396b66f9b31cbd0b61d6c6ebdf9a088cc SHA-256: 4cd5a4e3dff70043cffa6f66a26bd60c5e603168d69910209f03ecda221315a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external sites, many of which are hosted on compromised WordPress installations. The document body mentions 'Pubg mobile apk mod hacker 2021', suggesting a lure for users seeking game cheats or hacks. The presence of external links and the nature of the lure indicate a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and content point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/uplcv?utm_term=pubg+mobile+apk+mod+hacker+2021 PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/95c5a0d8dbaf25e610337d489b7386e1/50423046994.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/979ea5385aee3a6d36b8a7e5333c26dd/tobakaw.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/buzigubagivopovizex.pdfIn PDF document text
    • https://chp-travel.ir/data/file/jukataxon.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c141a922ddbc7bc9e47e43ae2c088525/16922674490.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a714abf9c4---zuvesixofasuziwoxewop.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fbpmu8phjf9qeruj4ejl24k07j/xasulenararugete.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/69320228624.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/11gq0t4k6l73kihucajvgseqp4/97882553068.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec9ca5d81---57500709174.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/04606c6a2d0156db061efea8c521ec03/dimuvorudil.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/38651745335.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/pemizepidezakonibugaviw.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e285bf200---79659487270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 5840 bytes
SHA-256: 3595e9f45db91839e5cfcf84b68672ae33d80125bd69496255f92a98579dd235
font_01_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 10848 bytes
SHA-256: 278610581ee4b80592ff807ff892653bbf4291f5e073cd2bdb1a5a6bc350ce93

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