Malicious PDF — malware analysis report

Static analysis result for SHA-256 7964e24b0df6f945…

MALICIOUS

PDF

84.7 KB Created: 2021-06-13 09:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ae8cdc4355e4fdaaa5324f948c3aa410 SHA-1: 6aef7b973b74f5897338b0328606c769accab848 SHA-256: 7964e24b0df6f9450ceccd7f7382057e5f5c191e7a0cecfdb9fe31143c8affb4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be to direct users to download files, likely as part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links suggests a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=essential+anatomy+5+apk+free+download PDF link annotation
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vofude.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/49315642753.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9c6d1667c---nilivi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9b42e10dcdc7c7078b71300d54baca28/detubebex.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/5b6b0f23de8d4c8815c1d81ffb8a16dc/43762671805.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/firox.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609065f38471a---57624557877.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160872bd90604a---82979702947.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa24ba419---vegegojaxutamimamig.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/086f3311c66dd2dc2043bdab7b50ff84/49575187708.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/53114930622.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a883da4f62d---12635585841.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747faebbb1b---dijudijawotejexuxego.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/84518149915.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8cd1bae28---menekinivo.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile/%5C/xetezomevizom.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
    • 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_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 5528 bytes
SHA-256: ddd1f51200cadda6f2bd48b5f4a5a63e41b6f504e715aafc39be53afdbf8ef37
font_01_sfnt_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 14460 bytes
SHA-256: 5451fb3a554160549226d90eeae8d382e3d2721bb38807b4cc5eef86e58c7a2a
font_02_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 16060 bytes
SHA-256: 8237d660401ba8428ede36ccf8f7052571d3723af4bdf68855ef081b2d5b1958

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