Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0b1705945ebec3…

MALICIOUS

PDF

106.2 KB Created: 2021-07-07 06:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 85a0ce77fbf14eece2fe1e1ea69fdf23 SHA-1: 5c8189cbf1b8c80ec9559bf310f3cda5c0a6ff92 SHA-256: eb0b1705945ebec3df277f59870d19dc0656fb0ea4db0fc64d30a5293659d542
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The numerous external URLs, many hosted on compromised WordPress sites, suggest a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a512ac23f20---dazevaxibudivujapatotiku.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/66bffd497bc3c80a9f2f89fca9527599/paronokilef.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/43231277879.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f6167ba64bbc42f2acacf2a98938cb75/kulelukodafojigozad.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/qrr9eipngbjh7kg7j03809gpsd/67640168891.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/farujaguwawig.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f71502505c24a5443d04e21fbd5b9bed/31941342456.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/80521074306.pdfIn PDF document text
    • https://anfauglir.com/images/file/wizebifogesusudaguveru.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/861a60253f475ec471d881e2f750a3dc/revorigepulika.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/19362006627.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7a0a1iov2jtfovnclq8ct4dadt/35744831249.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797112163e1---6298651842.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607181d8ae76c---63028627470.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54cbcc4e0---zidalaginivizowomonu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/9grna4tf8uua8aa1flljoa05ag/suwotavokafexakagigibepe.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/kobifopoji.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d62c618e86b---41425438351.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/99621100633.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a81f20a5e1---betusinimuwujib.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/lobox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+compliance+in+tamilPDF 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_off00013eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAC 10548 bytes
SHA-256: a19a9e69fa77cb68bbd5f5512b6970d45e33794ee850675053e1ad80f4291bc8
font_01_sfnt_off000156ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AC 16692 bytes
SHA-256: 11aa34adf8b3d7865643f4cd95272d3fbf1ff56cdfb91e351bc77b76b9e0de05
font_02_sfnt_off000181e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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