Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d98d9d458dfdc6…

MALICIOUS

PDF

106.3 KB Created: 2021-09-01 03:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11ba599356bb87d22cd2e565a431be2a SHA-1: 72e83279650afd4c93eb0ff484b23d8ff37b59f6 SHA-256: d0d98d9d458dfdc61cf942403104ee028f7a059d02a69e7984c04034541d4657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. These URLs likely serve as a link farm to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76df4a0fee---37450543455.pdf In PDF document text
    • http://vucert.vn/uploads/files/24862870133.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d39e8274---7614758966.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d6c1739c0---xipasutadakog.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/wupetuk.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c01d3f697f8---79087675200.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210814202721.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/jebutukule.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/tuvarunuru.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/pogefogepokozi.pdfIn PDF document text
    • http://skupka54.ru/upload/m/rimakuvaga.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/21167874090.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/tadosojisesuda.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/marabasi.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/79212628281.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b31ff3e832c---kunaxaligaga.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/numevufoxebunibase.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160921a8732d2f---88225006019.pdfIn PDF document text
    • http://elma1.ru/!upload/files/42418140056.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/mefesewajuwagatewuri.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/golokirixeresaxisumaj.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2b5a718d---30334936323.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/nerugojegibanimetajuzeti.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/93206969757.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976961d8920---giginugizategazagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ideal+icos+system+he24+manualPDF 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_off0001395c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 18524 bytes
SHA-256: c65039159e5dbcdaa6df361e2ec013383c2a6ec8bd80f7f93e278246a905ac4e
font_01_sfnt_off0001699c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1699C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000181b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B3 10896 bytes
SHA-256: 628d08b6e3ad955c775aeefca071790337d9d5a95a78ace30febc4b1ff02a842

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