Malicious PDF — malware analysis report

Static analysis result for SHA-256 4129b3ae92d6326f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 11:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 514ba657b58dc459f0f59d8b3e95e3cb SHA-1: a3c0b70c713844f09bb2e008451f3e95137ea55e SHA-256: 4129b3ae92d6326f23e1fbcbf135c5b0f63c33dbdde4400600e07c745276b814
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. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of these links and the overall structure strongly suggest an attempt to redirect users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b8bc0471---39093483740.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9dc9730600c07e1f251f615aac801f38/bolugavesela.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6c98e775a---gekisete.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/q3u4ub34j4r3tf7v4t6crtb264/gotakowibeke.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/vunedukoto.pdfIn PDF document text
    • http://fructusartis.com/i/File/pewoxose.pdfIn PDF document text
    • http://meskerjager.nl/media/files/kufegogogiju.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/12361650231.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/repuz.pdfIn PDF document text
    • https://medtek.vn/storage/file/21236712541.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/27490124056.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ed288c2ae---vavali.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/90366284032.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/68934079915.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/tonizebudoxojivabaduvajiw.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/mitusanuvexume.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/kinotozikufir.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/pakabujisemenowede.pdfIn PDF document text
    • http://centrons.com/uploaded/file/133211355260fea383de2d9.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2255e9131a---68939574054.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/gesobiluropawele.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/64814550050.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02a440634---nozuxefarozuxilukezuvemes.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/pobekadisan.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d8144959d---59922345549.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a050618263---91680010294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=biologia+molecular+la+celula+pdfPDF 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_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 10748 bytes
SHA-256: 171693ae3274baf2388cef70a8bffcdfe34c343446883c2c18bc6e824f81007d
font_01_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 17736 bytes
SHA-256: d2cf0ab867194fc0af03192b5f2ef16892c8d746f4ea21247d208d9d191ceb99
font_02_sfnt_off00013d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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