Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc844a69498ea72…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 09:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d861b06d0d56ec7a280f4f8080df0e8 SHA-1: 35e8c65bfca92e98a7e949559a191767d3648b93 SHA-256: 3dc844a69498ea72bb85ae690c0a49c667eeccd2c12c75c868ee1c3801b23d41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tractorpulling-emmeloord.nl/upload/file/75911585853.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/beb27bd69152c785de2b1f9e104fafcd/79170885457.pdf
    • https://247hvac.ca/fabulous1/uploads/files/18359282789.pdf
    • http://reclameindex.nl/images/uploads/migapodexitizifovi.pdf
    • http://homeopathyhk.com/files/ruwuvabujoxeriv.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc62ac186---josubev.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb4bc6167---zapiwesagabero.pdf
    • https://paklya.su/design/img/upload/file/50260178998.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qqu20rkhhorshkr6ti49umnfm8/7181548883.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ba21f1cb---wolidokogesumonowifejorag.pdf
    • http://51www.org/uploadfile/file/1c535fa98c24e724d0fbcf4e291ed08d.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8tkuqtep09qcu7f09gs04jjrti/81092792995.pdf
    • http://mobilenmr.com/files/files/ledivifavad.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906985316fa---torewifezumidadub.pdf
    • http://nktrading.qa/file/files/reneviwejivu.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d1f2615b982a7a8fec2a16a2e924581/punobukodoka.pdf
    • http://boekenwinkelindex.nl/images/uploads/defirelisizonowurowa.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d437b348---remanim.pdf
    • http://www.armstrongre.com/files/files/dugujumupilowev.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/patulunide.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6semjd0a5uksjbsfeqbk9g6el1/47806779574.pdf
    • http://munsusa.org/userfiles/file/20210603050152.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/eea25f248345a561194df9971866dd95/gobaxavulisuzofep.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6lupvqdesmrp76qljh2kt1e356/68598008263.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fire+mod+apk+unlimited+diamonds+download+new+update
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9b.bin
062b644e51d9de12a10f019f38bb7edfee6a54e27f838a864bc75fa1069c0a99
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10912 bytes
font_01_sfnt_off000104dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16792 bytes
font_02_sfnt_off00011cef.bin
20d833093957938dd6ee7ebbdf4b0c113f7845400aee65f561b0f8f2847860c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 16924 bytes