Malicious PDF — malware analysis report

Static analysis result for SHA-256 5685b866778cb069…

MALICIOUS

PDF

86.3 KB Created: 2021-07-30 06:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 710502596b95200e1b65819ea21da530 SHA-1: 570390bc811b0f3c262032df833c63dec0be75cd SHA-256: 5685b866778cb0695f2ac858744daf5d9858ea2d41a1404903fdd257d4db5f55
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains, suggesting it's used to distribute phishing content or further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=annihilation+of+caste+pdf+in+telugu PDF link annotation
    • https://mldom.xyz/web/img/podborky/files/75496861202.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/lutojetimofaz.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/4b0kfga3pneb2qhbbhnan2e28j/zisugegexekegetofitasawa.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/xowasipidipuzon.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/91542a7176f92c729f8c5ca39e63425a/69864234050.pdfIn PDF document text
    • http://jucal.es/images/file/zelewibatupavunolal.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/87048375216.pdfIn PDF document text
    • http://afro-safari.com/upload/files/72224021779.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/da9b8c976f7d39417361ee6e208a9a31/kemisobupo.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/bekad.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/befupupemufusijuf.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/74522746457.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ff8c80793---janipexamewigefomazus.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b2e71cef6a763bf7a156bf1a1aff0329/rawuxolod.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/wikawofuboxopilama.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/59626009627.pdfIn PDF document text
    • http://bjallstar.com/upload/file/77280918354.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/8654a36a5eb333d3229f37c800a08e7d/kunasabi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbac46264---namib.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/13cdkdnkp8kdbamqmtd364g1c5/kijexejiw.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee3a1362844cf757d9bbb0d5d9c445c7/fodonixifusanofakivanumes.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/52537661022.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a84f6cf24---gevaguxerarefafewosi.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/mezibiletizatej.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_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 16940 bytes
SHA-256: 01b488164fc43967991062a1f1d21c16eef30697321355f5bafa3b7c99a73335
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 10880 bytes
SHA-256: 4da4ae19c5be0488351f88bf8d39dde0d53c9ceaa7391bcfa740e5258f3acec2
font_02_sfnt_off000133f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1