Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c27eb6c57bda91e…

MALICIOUS

PDF

79.7 KB Created: 2021-10-11 16:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31cd8799c2e8f6c6cdcb5fa1ef7db2fd SHA-1: 4bafb8b9f6b1304876f4ac751f82ef845ec25f5a SHA-256: 0c27eb6c57bda91e1cb637f22940e7e340f4d0af1a77f33bc809f889a5ccd208
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and the nature of the link farm indicate a high likelihood of this document being used as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://strechybenesov.cz/content/zosefobiwogadoj.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6152bc4f---nizaropasapafinomoxezebi.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21100118053787260143m57w1iem39.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/purosipexik.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/81147162012.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/54404876365.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20211008120001234.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4d709504e---65062686038.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hvl20gnfqaqg42ahue81i6298u/berulevopu.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/litosaxamitoku.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/mufovaf.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fb8ba2661a83d337a758c79c0d0184e0/75866781054.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dn11af9rknd8n1ktgirhffldaj/52963456491.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/77048127937.pdfIn PDF document text
    • http://gardatrans.com/content/Files/85478310968.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/48458192764.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/16520304561.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/16224260752.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161595c8ecaa82---jefobefakerarusip.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/75917801861.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/87398844701.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/vumugetewimoromar.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/4403431436.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=321+stainless+steelPDF 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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 10128 bytes
SHA-256: cace5845026864c0adcb1319d4e8eeaf8be8fce89ea00213ff006262b1ddaac8
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 17896 bytes
SHA-256: c7ec496ef3098e58ed7cb9c7181c2cef77724ce51a9397eed612c2e9b711057e

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