Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a3d0908358f6b2…

MALICIOUS

PDF

76.3 KB Created: 2021-08-27 22:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74d4f1a0a4cfeec8a458184cbdc24024 SHA-1: dd1480c7663c2a157b6952f089b7fad13cbbaf16 SHA-256: c4a3d0908358f6b2c6bc3541bc0dcccf6a3b406a21e8b6f24c06a67148a72a16
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream and numerous external URIs hosted on compromised WordPress sites suggests it's designed to lure users into downloading further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates it may also provide password instructions for encrypted payloads, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=tons+of+fun+meaning PDF link annotation
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14b24a27d---degopabo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a63ccb37bce---9852366019.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210805230449_0xoywi.pdfIn PDF document text
    • http://juncheng.tw/upload/files/9210699093.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/5892084947.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2457c787---17273712026.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ed9a9d44a---famajuwotugufi.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/45645356471.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf847345e6---zesomuduniwi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/33feb425c37dd856b8fc1d4373e954de/sedisixipamusuwevopenoro.pdfIn PDF document text
    • http://www.asslar.de/downloads/11605152772.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/59405623342.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609137d65977f---putaxiverafawajiduwusini.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e43cc6ee---bopapexifimewe.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vuqvcpmdi1nejefkisugd0hdn3/dewowewekunivakizalor.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/dfddce49e5e64e408392267dbd77d55d/31571761055.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/bomenow.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/gorofive.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/36266013278.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210615210133_mvsfij.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32d232e005---13481964980.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/66476691083.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/32424689971.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/jibufidi.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ff8u4seneds3i62mq0duoiqv02/75244214921.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_off0000c73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 17148 bytes
SHA-256: 260170643e093951ac483b1fe6eb073779b0a6002fc2317048e9f169d0df08fc
font_02_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 10376 bytes
SHA-256: ba323b2e6d576e599f4fe1ecacba26c69f8c8dad05802a2f7ee6cc02fdf74c92

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