Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d937beefa82ba8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 16:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 65102f53d61edac52574b4fb8b50a89e SHA-1: 23a9dfaf8d3dda979abd0f06e0ab3f25c4422512 SHA-256: 93d937beefa82ba85c127be19abbe4145ddb6ace9b2e96b3020a3fbc0b8b95a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host malicious PDFs. The primary malicious URL identified is http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/lopujunadovudebidok.pdf. This indicates a phishing attempt to trick users into downloading further malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083651e3dd75---laluzopazapon.pdf In PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/palepudoxaxukeg.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210824_3DF8F26980AFE7EF.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/49596242ac86e2aca4658bb1c6d7f0a8/majovetog.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/xuwope.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/24c2fa170d75ef394f7c99e2b61ef1ec/54971610233.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9ecddfa4c---25637856194.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad2d54ee6---pidifilexinadififoxapatef.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/vabinopumofilaganevi.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/nebugegixokokaxope.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e68a456d66---94874944948.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/raliponuzorufo.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/85450580495.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080959eb823d---faxavirevezagubebi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e46eeb9aea6651f68748e5b662e2828d/59303619030.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/xosonebirubomipo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609122ea0cac0---detajobirekudegup.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/lopujunadovudebidok.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/29918786865.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/zatesubisufisuvede.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/dufinuzikaximopojepow.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd16f1e56f---gugetitejisodu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/cragnh4j4jsku481bloct6b50o/vikipewodixokeve.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607418755acc2---76491643790.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/42074120874.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/86842124795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=earlex+ss77+ussg+steam+generator+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_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 10596 bytes
SHA-256: 8425b235f4f032996b924e0c2f1d71817bdda489241893d44127d3728cb5f50a
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 17496 bytes
SHA-256: 28ea4ca218136d0153069bd89e9f98633ca25eed9e07bc8ef7757423fb2eb862

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