Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cd41173ba0d59b…

MALICIOUS

PDF

93.3 KB Created: 2021-07-04 06:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1741c2188b04d917d2b5ceb0b02c9fda SHA-1: 2a7a633b3cf5744c34747c7a3ff2c2eadd032a69 SHA-256: 19cd41173ba0d59b2a70a44a4c30ebe33393b31f45b82eba8ad40dd60ed8b34d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • 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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986480efafe---52356966062.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/3bc52c4c6e947bcd4806a17b41f7d56a/mukiwovitub.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7452f8nv4e01anmu1gnkqvbr4i/sibovatikit.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/mivuxakuval.pdf
    • https://callmarkinvestments.com/callmark/files/wakezokeb.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f5f51f80b---43550231825.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/058e7274d477643228877c72ef4efe01/vufor.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/7b99b3449379ccfc7d8d8b6d1da802d3/rimotebabifapodafasav.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/sesusetakoxef.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/relixadagulijoseloromavus.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2553bf6a16ce914e985983d06e29114c/96030221320.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/po0eo180va9v14r4ble2l1905r/bilukulos.pdf
    • http://nebovsem.ru/app/webroot/files/files/44127190655.pdf
    • http://bitite.lv/media/txt/122/file/85106045620.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087495bd4d1a---45181379657.pdf
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/75845659699.pdf
    • http://chayka-svg.ru/files/66525810535.pdf
    • http://shannonlakeestates.org/fck_images/file/rorakegunexoxezolujatuju.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/35632233449.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/2288121102.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080155c7223a---42562269743.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=in+ordnung+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000149ea.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x149EA 18328 bytes
font_00_sfnt_off0000d3d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 16792 bytes
font_01_sfnt_off0000ebea.bin
322c2ef01fa533982b7df14095fa8d8d471406bbc0a1addc2ab05c2468a754fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 23756 bytes
font_02_sfnt_off0001257c.bin
6db2454c9103cb72af1b46b4b441d4e6154c3e8ca45cae75de85851100a78e39
pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 10328 bytes
font_03_sfnt_off00013c70.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 3464 bytes