Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fbdd7aa41b7d1a…

MALICIOUS

PDF

74.5 KB Created: 2021-10-12 19:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 46640c07bd16e15e396414f6b97c74f4 SHA-1: f06a4b9bc98f090f1a4a121758d92e5ef249924d SHA-256: 12fbdd7aa41b7d1a2c1e4df7c8f927b25f10d0e97e96453d8c7f4d98fce2f366
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and a link farm structure points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ismet.com.br/ckfinder/userfiles/files/lezagawotelukito.pdf In PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/ziwenobifam.pdfIn PDF document text
    • http://juncheng.tw/upload/files/gutafobebobemovat.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/disanulovujenoxorurano.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/86961973355.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/pidofafa.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/ludexepojatuwidefegisas.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39318a6ff---melurekekurexupofemu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8af0b583e---25106960554.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b8381fa4d7a96abaf9a66379c542ac43/pevugepujamuz.pdfIn PDF document text
    • http://ccshecea.org/upload/files/11446372602.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/97206346358.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/j4f0g6kmm0908i6n775nkcnnj7/82330319293.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/fazuz.pdfIn PDF document text
    • http://93564497.com/userfiles/radaguzebikimesunalosaro.pdfIn PDF document text
    • http://katela.net/userData/board/file/foboku.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/71007283102.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471d3a33446---52090535341.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/biritikuvidafifab.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8senhkpe01s1tf8u70svujbcc4/13978443477.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/nowezopu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16160e2a0d410e---joxomexotadetiroz.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/sipofovofojazivig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=editing+pdf+files+with+openofficePDF link annotation
    • 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_off0000bf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 18056 bytes
SHA-256: 282fc646e895a972db5e82c1577a0bf4ddd0805d3ec2cd95042c174125473971
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10704 bytes
SHA-256: 5d8a936d997fdfee8421d9ebdfe2a6ffb3ab36cd144aea3c422af7c98ee497b8
font_02_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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