Malicious PDF — malware analysis report

Static analysis result for SHA-256 f652f80e07f5ccd0…

MALICIOUS

PDF

69.0 KB Created: 2021-09-20 15:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34cd8a3e87c2a4de918a4dfe9c909ab7 SHA-1: 6f12f445bbeb6486b102cbe75c2458255f214896 SHA-256: f652f80e07f5ccd0b7fb84ca87524c33cd17a19b223d8c73cd06b217ab3900ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which are hosted on compromised WordPress sites, indicating a potential phishing campaign or a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=water+io+games PDF link annotation
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614348626ec19---ketugezezadezubobubeban.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/70948211089.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/68876314480.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/wugegagajugileregitud.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/33552001001.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93480777590.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/bakinokutodumulefesivig.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441e53ac34d---40958620549.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/12154753691.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/xopitema.pdfIn PDF document text
    • https://halkum.rs/files/fomodixesumojefalu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351bfa2bc26---fexape.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210917050536.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/26804784749.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/wuzosovorokukevokeminobip.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161378a501cbe3---36347278781.pdfIn PDF document text
    • https://dintek.eu/uploads/file/5977153262.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/zutoxesariw.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/gazonodeviwiwarid.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fababc641d03318466e4562b493385fe/jumimiritugufobiwur.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/66674089810.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/mijegifodixuwurugedapa.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/sawemubos.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/83155742886.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/66517074188.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_off0000b179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 10296 bytes
SHA-256: 2aa9d163776b75f3e2a62e479eac6f99c673cf62984b90f19eae95a6f4da3231
font_02_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 14940 bytes
SHA-256: 15340a03ab421acdb61e8aae2db834fd7d578f26c4f4d61ecc700d43446bf071

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