Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1879cd70987122…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 23:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1ac249d288442ad2dbfe8968892543a SHA-1: 89ff7c984e9f2b9996d8d52b2079b83ba43b5e17 SHA-256: ab1879cd70987122794e934c0fe278bd645334d1ce56801bf25b4b30870b841c
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 designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=android+trust+anchor+for+certificate+not+found PDF link annotation
    • http://everintelconsulting.com/upload/file/202109190310266705.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/nukukazuwozidukovimor.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/28for2gdsggrsjccdsuo1ldtuf/71213442976.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/56244564575.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/nawagowebalek.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/9599769285.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/perinapiworipetifalasufo.pdfIn PDF document text
    • http://micruts.org/userfiles/file/tunexosetobosesivupego.pdfIn PDF document text
    • http://zeci.nl/im/image/subawupelapotubagujojox.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e9b5481029a25b41b58a4f5ee942a7c4/64862162398.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/28634871711.pdfIn PDF document text
    • http://htcable.cn/d/files/wepuzirutezixajuvibuv.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/17331227981.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141e14ba06f3---75811457183.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b3cce8a1a76f81818667126ddc2c9177/dikobutekige.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/46632087316.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/joruzorozavifubivupu.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109022108509027.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/wivokavonidulagisi.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/17189095711.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/54895485107.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/nejamiduraza.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/muwijimurog.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/49373548192.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_off0000dfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 18108 bytes
SHA-256: f84b855d5affa33c916609d0bd95e8f722a5f46c9bdb2671cd32065561b09870
font_01_sfnt_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 10608 bytes
SHA-256: 553fc4c5549d51b277c0173a45c1afa0a3b1a05f893bb97ff894c25f2fc23322
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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