Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dda852bb7bcaaa…

MALICIOUS

PDF

111.1 KB Created: 2021-05-28 11:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004ed73a11a00c5f49aa87c4dbf172a8 SHA-1: 06f62cf3b6fde343ace9eaa5f06d5f707e91f99c SHA-256: a1dda852bb7bcaaa3ac509920361987f09afa12a798348eb66d0f51282b34434
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the heuristic firings and URL analysis point to a pattern of luring users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=quran+30+para+all+surah+names+list
    • https://hosvagyok.hu/userfiles/file/lavubofonekugem.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/29016c0662f7b2d08c9b36e43cbbf1ea/vefiluvavitunezimumofuz.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/96c6b22a5a1d3ca5ed86851a332a36c9/74167395099.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kvocin469he441u7ee2n7moo3c/51096869745.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/libiximajav.pdf
    • http://www.kilincsweb.hu/fileok/file/likisape.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/848d5ed949e420a1dd2b92ebd5a5dc8f/towaresisokexevevisukewe.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb279fc7f---ligiwugasiworepike.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/702bb83b6e9a3f272c47532cb11b6dfc/xawodik.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607623d45f1f2---32369244470.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3042a1c3---18715858120.pdf
    • http://kulturazebrak.cz/userfiles/27378651173.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713f7a59a9---lipuxiragazav.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5f1aba11ad766207a20c87d9df94732b/tepuruxeralafelo.pdf
    • https://asset-books.com/userfiles/file/xesipavipumika.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0d682def---xupira.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/432bb7e006b3d2884eebd09b507a1958/dobejetapofetukim.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/0b7hnl3kcaf8c6u18of1sf70h1/18029488530.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00017b1c.bin
131567f48a7d998cbe5c6fcf819ee85acc8ec685f27badc3bfde2c138d1cd834
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17B1C 28928 bytes
font_00_sfnt_off00014056.bin
34867540cf9d352d08de82c727f0c31200a70988fad45f726dca9fade35aec57
pdf-font-stream PDF embedded font (sfnt) at offset 0x14056 5424 bytes
font_01_sfnt_off00015296.bin
104f43f9d74b5c51d723cdf122553bcf57ffa80daeda63980c13ff55cc86b019
pdf-font-stream PDF embedded font (sfnt) at offset 0x15296 13460 bytes