Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec53308bff15936…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 03:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8cdbc29899b384f018ec353997623880 SHA-1: e51e462e3b6a37456bc049dbbae91a03fb7dc471 SHA-256: 8ec53308bff15936171397e5f12bbc4dfdd785a892da3cefeada0e19600c43ae
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely intended to host and distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160febefa9136d---ritazulomolawukusinoka.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5c0e0d4364cd03bf69c1289c09adc08e/27654828140.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210523084516.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8d90b052---95933226539.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/23414805347.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/73565455449.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7143c714185208d98d39050ea3fc6d35/vosus.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba27931e3---tusadalobubunikasuzevi.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/5042729890.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048e4d88ed8---tagenanaworuwimetigibew.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/4698286538.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/81628644377.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/bizotax.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/64671562079.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e540ce82---37210127882.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/gonukomufopimudogebuvali.pdfIn PDF document text
    • http://logicamail.it/draft/media/21368254909.pdfIn PDF document text
    • https://basisangka.com/contents/files/11130694960.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/sabes.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56b01a7339---wurofegilo.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/13757445503.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/53p0epfnen9m5a9de67t1kj550/bakusogunudulujukakuduvi.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/a1157c9940b6ee4acedfca222529a983/batix.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379814b59b---xisafirarajaxovax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wrecking+ball+mp3+song+downloadPDF 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_off0000c100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC100 11244 bytes
SHA-256: cab2ddd5f9045a3ac315ae2f3dcaae94f789def96f626725684b9e2eb5962c12
font_01_sfnt_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 15912 bytes
SHA-256: 2af816463fdf848cc4bcde35651cdd7f440f0657e8e3809ddbae08aff359fb0a

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