Malicious PDF — malware analysis report

Static analysis result for SHA-256 6403cfbae96ee2a1…

MALICIOUS

PDF

86.4 KB Created: 2021-07-06 11:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3bf93c3a0b4fa3678910ef2bd6bffe1 SHA-1: 6b9591a9c0e5bba19a9642e30f78e358a3866ec3 SHA-256: 6403cfbae96ee2a1e72e9f9434becc78c989552c73a0bceb70cba892e513fe09
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress installations and disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bec33dd72f5---89455589402.pdf
    • http://safeabortionnepal.com/userfiles/file/46476308695.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3fb5bba5---nisinego.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/51874534098.pdf
    • http://abwcrainhwy.com/uploads/files/tezewawokisamaze.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d165af4a---wepekoz.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hvi5373n6q4lfn6guu4prbml47/mijerifuwini.pdf
    • http://botosani.ro/img/uploads/file/53419489779.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b71926c84---puzikebu.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607366a384f1c---paxebusagilijazapedepar.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c97c0f8937d---33220814306.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/784a9a37cd9d3cb12bb1c5435dbe22a4/xiwadatufoduxenimu.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b991d84adb---22173541064.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bdeaf5b9ce45dd22046593212d70a347/89568092021.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4e451f20---36271429233.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8087f695---93450424879.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092917aa5c20---nofazadesava.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9a68b3865e9949ba7e8a86f702cd79fb/16763267726.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v3fqkmdhgmkbiilh7052dhb8ed/33175629141.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34504c51a---21768449127.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a8ae8e5392b9cfeae2ba9ed47d971f85/88308815199.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa03a178d0---sezufojavusudigo.pdf
    • https://dolmalatrek.com/userfiles/file/vexemorikarakumekedas.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da997a845---renavovaxojixewuvapabuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+digitally+sign+a+document+using+dsc
    • 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_off0000ef47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 16792 bytes
font_01_sfnt_off0001075e.bin
3cee937fa8ef9acce706ed686ee0f6568268ffa62f87cb619b2a7d2c6844f9ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 10904 bytes
font_02_sfnt_off0001206e.bin
3be9724e0ac0461d59682723117ef758531a46a8e1beeed6ef7f581ad2bd6970
pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 16760 bytes