Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd66ff4d76c77a6…

MALICIOUS

PDF

108.6 KB Created: 2021-06-30 19:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5727dae216d162f583d5b7360c81d12f SHA-1: 03075ebd7e77cfcea620622e3b28f99dc2371d1f SHA-256: 9dd66ff4d76c77a6f040e9fd1b7a55c832f7b05b4f764d8cc4ca15ad8355697d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of a raw IP address in one of the URIs and the ML classifier's high confidence score further support its malicious nature. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://besttailor.info/ckfinder/userfiles/files/57410546397.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/43b71b2d6a7145946467bc23fb1da709/8843062161.pdfIn PDF document text
    • https://medtek.vn/storage/file/vofuborixejanizivadodevin.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/196vp82sgeft54qiahjadpo5r6/25088001572.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e0ad5f1f7aa14f707bc2b77f1b18d7b0/35706484201.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27f8e0a988---20329387221.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/10ccf8d1ba34d1da6b352e202585517d/99184361467.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9243861ff995e5e7fed0bb579ce5f17f/pebemumu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c870d7e782---21379126374.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847e073f8d---nezakaw.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de228aa89---73059120461.pdfPDF link annotation
    • http://glotecgh.com/upload/editor/file/36894434787.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ucr67buc4f9qocmt678nbgv4l5/12542952181.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/83510552451.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/efm0k77p5alhkc8q5c0a96976t/96351210438.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2cb0b7198---65675487105.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/664e9e8cbdb7c47416f9190ba2093d51/gewuro.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/bijofaxiwunirojugemo.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082311dae146---25839818270.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0191339b---wezuvezuvoladikukitedifib.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/bapis.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/60807367008.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e932eeda---44281107427.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/97801767307.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/64789318990.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/jibemilokis.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b782dede---72850698410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=twixtor+pro+after+effectsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10472 bytes
SHA-256: 2d0a805bd168bef61dfbcb5fd410608c834bf2e41ca05ed59c2ffe16467ceec3
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 29596 bytes
SHA-256: e42010ab9e2c7b475a4cbb05aec9e51d1c86549bec541b81b69841c14d9ddf65
font_02_sfnt_off00015bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000173ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173EE 19620 bytes
SHA-256: 0ccd67e4333ed47eac9199de93ac594bf0cd1dc7d09d61095abf446e14d4d5a7

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