Malicious PDF — malware analysis report

Static analysis result for SHA-256 94933a891810388f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 03:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dc536bedd0c2a009e3852d532d1b5096 SHA-1: 9319fa56526e9eecf84d9cadafc943c8dda48c14 SHA-256: 94933a891810388f75e5b44a9af1a0fc8f4d38bb7aed2ab9f9c66c812ec483aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=unknown+app+android PDF link annotation
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aac6dbcf0---xodunemerukokatoteto.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/xemarubazanegigafijupir.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/vifojunatolikosa.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/kefome.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/buwomis.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/38786970762.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa4ca991b5899fed43817ddf5b36cbaf/42795232842.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/29901170011.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/xujuvanozexapakojajudek.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612feeab01b4a---7583722436.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/79420964695.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/mokokevaj.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xutisaseladulenasewuvevig.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320c3146dd9---gegev.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/fibametiwa.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/r5835o54u6vsaha63kh724tv06/83564746006.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16142415b19bc0---kigavoporawaxenilul.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/23087767416.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/fexin.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/koxopipuwoso.pdfIn PDF document text
    • http://mq-water.net/upload/bozedozazoxuwinisigejomev.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/sagebenipewa.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/40032165919.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/4922701488.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142758575d05---satoladikir.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_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 18056 bytes
SHA-256: 684e7cd9946ea5885d96bacd82dab1307c7f4370b3dea4ce1824916840abdb93
font_01_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 10128 bytes
SHA-256: 7de8d299bb28d423ed587c1c4dd411cb559b7086be5f0ad15a9a8e3f7f16bb20
font_02_sfnt_off00012d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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