Malicious PDF — malware analysis report

Static analysis result for SHA-256 a490162adbd0a9e0…

MALICIOUS

PDF

105.2 KB Created: 2021-08-12 16:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0bad4c9e82a7ea8a00b1192d7aa91d34 SHA-1: 2fa33314c729561d7d8ab86f97415a7a28f0e13e SHA-256: a490162adbd0a9e07b18f8878e176a75190b59781eb68845ee48e2c2c1fb3b71
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate these are part of a link farm, likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1a4c984e015dedebf29f310ef6d7c4cc/winagetutomewega.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0786aec9e---fujonixabebobovigetag.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/robawolusedo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160792575c14cc---mabegibazedukaleragi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ab71be22f---77329223362.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/lorirasuteputubegibuz.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/gakogumugiwudazefemivi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8087954c929436628ee961ab01dd0973/kumifenimeluzikuwadasego.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e0309cc24---sujoxalaxugareserefojes.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/62437602679.pdfIn PDF document text
    • http://ubest.ru/images/file/gibejetixinudutalurepami.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af1dfaee01f---79436135419.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zoxifemoziguwavike.pdfIn PDF document text
    • https://0900107678.com/upload/file/mezavajibape.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/febukifovojomototib.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/19d3m844j5jllsnej75fca48b3/nekazufujedemuvi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114322635e13---79108293558.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/83262780994.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bff4010bb0716d11633266ddc2ea8fca/77785243834.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/48559722670.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160904dcbd40c3---69458080640.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/66179397038.pdfIn PDF document text
    • http://huiking.cn/uploads/file/111218066814.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/24142889564.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4270d42f59b292ec747004e463cd4394/dajad.pdfIn PDF document text
    • http://compsult.net/userfiles/file/23355905231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kotor+2+atton+jedi+buildPDF 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_off000138f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F3 10556 bytes
SHA-256: 43147105fddad3b64ce0f854723eb91d91fe3840d41112c262eed9fa7595eacf
font_01_sfnt_off00015122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16934 17316 bytes
SHA-256: c0ee4e4374dc015d23bbd8554f47462fe465878fc8de1eccdb5eee7996ec03cc

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