Malicious PDF — malware analysis report

Static analysis result for SHA-256 db912926d3cc9908…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 14:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b8b6e657ce64ac9992fde61f97272b0 SHA-1: f42253b81eeffb497231cc97c71ff8e41ebf98cc SHA-256: db912926d3cc9908927fa32a6b6440da21b8a521e8f4b815894ae3bbf77c3c3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a malicious payload. No scripts were extracted, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to a deliberate effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=lenovo+ideapad+520s%2F320s+hardware+maintenance+manual PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/de2b6f8267a5cafa7c9bbc6be0d671e7/sewufasemoparigiguk.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/nofugevedimore.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610315b060706---69867534020.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c05dc1ee17---tawixedaxedopofo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/7165449409.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/31652386830.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c93aa44877---71473498415.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a13967b6632---mijusezutepepik.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/qqbroro26kajjv7efaubs2ifr5/56301454809.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/zedazikizovimuvopakewuje.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/56439864325.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ea89a7d5558f98e33f9ae125c899bd63/90337007641.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/89070129573.pdfIn PDF document text
    • http://health-bridge.in/upload/file/dubifotudulidiririzibopon.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///34992352740.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gaperu.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/60020628461.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/64221373970.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/vopodepakiwuv.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/77342379470.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/xifusizebiwid.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944a4c1ff9d---jaxotepalurenolifukosido.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/30939571768.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7166136e3913744ae6a91cd086cc2cfa/juwonexig.pdfIn PDF document text
    • 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_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 11568 bytes
SHA-256: 863d2e04205a367aa7f98f191985dabbf4d59f710b9e3a784987f313cd781659
font_02_sfnt_off00012e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E62 18000 bytes
SHA-256: f88d3496f95ec53bee77934b16fe221cd3e67759d9196a7976ebeec1651fdb6d

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