Malicious PDF — malware analysis report

Static analysis result for SHA-256 257b568572e589d6…

MALICIOUS

PDF

79.7 KB Created: 2021-06-30 10:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fe182f59e3e17713b6bc4fe6f4a2d53 SHA-1: d9d9780e6228f6051c8c3fa64f0203e606189af7 SHA-256: 257b568572e589d6c151d3774cf7a4c86cbd6b7bbfafb33f6f5a77ce516fe7a9
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 an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external URLs hosted on compromised CMS uploads, likely for SEO manipulation or phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483498617f---79192441772.pdf
    • https://landatur.com/files/galeria/files/79698708275.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c771d0cdbf---23493498499.pdf
    • https://trimix.bg/UserFiles/File/62054916539.pdf
    • https://mobilieroccasion.fr/uploads/file/17668766616.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5401459185e20e53a785dafbd2fe2e33/74419280848.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13638423525.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/v0jeou4smv4bh7u498hethec12/dinelesumuve.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377bf03c76---kamewifawadiwori.pdf
    • https://bistakalikotenetwork.com/userfiles/file/lewomo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a96c9bf49---82037560111.pdf
    • https://melz-feu.ru/upload/zarofinovipinesonotag.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a502673c1c3---rilil.pdf
    • http://birkhoffhi.com/userfiles/files/zufasabeda.pdf
    • http://vistobrasil.net/uploads/file/zurirupopezaniteg.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/vuxopokijibazovekijo.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a748eb1ea0f---59415783406.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a104770966cc0c821c780dccb297f36b/pobudimuz.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8957864784---70507971821.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/qotal44egm689roklal1t85g6t/xuzul.pdf
    • https://belhasasecurity.com/userfiles/file/dusaja.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/807dcaf8700afd456473533076382018/33473980782.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/u9q7e7r6mcj0hggenjhfig1qqm/6149946391.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/404de41358fdc401b73978a629b8f67d/sifumibunuxo.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1896102e70---34024841693.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c51202d64b6---lafoduvijip.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732095ae5f---94980798772.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+coin+master+free+coin
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b9.bin
e5bdeba51ca6179ad540f09fc7655c7aba8f7c11062e5060ecd0846494437b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 16956 bytes
font_01_sfnt_off00010196.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 16792 bytes
font_02_sfnt_off000119ad.bin
aff289826970651520cd8058eac0ba5edfcb11deeb54cddd2f182a50c0a9e969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 10428 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.