Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b3922e82997d73…

MALICIOUS

PDF

83.9 KB Created: 2021-08-03 10:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1998e270508d640453a9dd37de88685d SHA-1: d73b3bb7c11b9342e374543657c4682645b9fbb2 SHA-256: 18b3922e82997d733f0d28afff9a359c7d1aac2cdde848ccfdee9cefce58c4fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of 'account will be terminated' and 'action required within 24 hours' language indicates a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=childish+gambino+awaken+my+love+vinyl+song+list
    • http://dh-life.com/ckfinder/userfiles/files/9727712701.pdf
    • http://www.moyekolodin.com/files/33588640395.pdf
    • https://jurad.eu/files/file/23272770973.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37a1376ef0---55439465137.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cd4568e4e66276634ae8cd2017af1ebc/35606417278.pdf
    • http://moriefrusca.com/userfiles/files/15692139583.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/osavm42rrg800481c29sb2907d/zowixan.pdf
    • http://sumterhigh89.com/clients/863574/File/bajodedubajumit.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nezigulusosi.pdf
    • http://airmon.hu/images/files/16052833332.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608952387dcd9---gogijobowomirutuvegub.pdf
    • https://jasz-pap.hu/UserFiles/file/85772544324.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f90701277f1---94793926472.pdf
    • http://sushikyototogo.com/uploads/files/jubipuvofotazidakaxi.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ee763ee8813d3ca67a25ae050eff7754/54114544587.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb357d5df4---patubefabexogekewuxo.pdf
    • https://medpressa.ru/files/file/xopemipujebevowixozuvada.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7fa687e2---52540131042.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/i5nleipk1a25ic2v05fm01uo6p/47811815872.pdf
    • http://otvorene-srdce.sk/userfiles/file/71430324197.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/61141249c9fa2ae3260300b67fd934aa/12641460976.pdf
    • http://imaginove.eu/data/Files/50797138757.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdeba3d68b---73253084377.pdf
    • https://digireg.dk/upload/67295831173.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b21d06a70---mekusavidosumugatumeb.pdf
    • 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_off0000dc99.bin
1d9f44e7c4051f2a7e40196435556697619829101003692be20c34c267220679
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 18436 bytes
font_01_sfnt_off00010d0b.bin
afec87491ec83d70b814906237d428f4aca1a132ffbe841c0eb397c4f15766cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 11124 bytes
font_02_sfnt_off000126ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 16792 bytes