Malicious PDF — malware analysis report

Static analysis result for SHA-256 60866cf03388b409…

MALICIOUS

PDF

81.2 KB Created: 2021-10-09 22:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a27227e9021ddaf8a7cef37529e24c26 SHA-1: 65f6b422143d05c9f477322782140027123bb061 SHA-256: 60866cf03388b409cf5ebdc5f675ac5ee198c546dfb320202af899324196c96c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious websites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of external links suggests an attempt to lure users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=carrying+hope+surrogacy PDF link annotation
    • http://parentini.it/userfiles/files/78843271008.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/95513052778.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/bisowipenomewokedu.pdfIn PDF document text
    • http://websitesample.in/atlantis/assets/ckfinder/userfiles/files/24695750696.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1616000545203e---robaguvonodaremivolaxazi.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/volegolevivasoro.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/28578920113.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v658q2s3ko1ht6ftqkqcl8cc41/tunigoxezalobif.pdfIn PDF document text
    • http://daiichitelecom.com/uploads/news_file/sagigomimafonolu.pdfIn PDF document text
    • http://mp-journal.com/media/file/kizamowit.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fb2d562043599823ca0a49244f9bd001/kegufowiva.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/19085753516.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132116768856---leguzi.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/40803073605.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/liluwanefufafepokolu.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/bagapikijigejubizituwevuf.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c4401580d7ec4715bcd2e1eeb6e77de7/xezetinevebiragowegid.pdfIn PDF document text
    • https://matricula.hssanesteban.cl/files/37974584830.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309b8297e34---mijitetazosejerexesotigig.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/viwokovafedozabejuporok.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/13118476136.pdfIn PDF document text
    • http://pololanna.com/user_img/files/zezufagesepili.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/13789190698.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1615940470e175---29785669539.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/55274966163.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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10756 bytes
SHA-256: d1a3febb1c5b154a81969d8434bde4d3f2fd53b27b3b740cb810506023e0b0e5
font_02_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 17600 bytes
SHA-256: 6b075c935429803d7b536f90c91fddcd369694c38273dd9d2e95b3b4ce998666