Malicious PDF — malware analysis report

Static analysis result for SHA-256 963ce0ff6c9fd37a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 03:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4956cad1416839809e60b46775bd29d3 SHA-1: 503d76c907f8465c0a345ba84868cde1ca4d2938 SHA-256: 963ce0ff6c9fd37a3aa43f9f11ff427b93cb3c15f6899a68642f31b3785bce81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to create a link farm, likely to manipulate search engine rankings or distribute malicious content. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=possessive+nouns+worksheet+7th+grade PDF link annotation
    • http://cottoneauto.it/userfiles/files/vuvefazofalibupejogebomoj.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/f8ponds6oo25spjfu4epe8r5j8/80925348250.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/80095736301.pdfIn PDF document text
    • http://ropesadventure.com/d/files/mogiravivinarek.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/kekok.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/potakebisuvifamozuzesawu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c408f269---notagexubusexi.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/72178491056.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/fafiluxugevegane.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/tegegu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7e20df0827d7c18ab6ac85cda232dff8/84089039230.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d29fc89cbce99bb58f393b4580158602/66962057539.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/olni89veb4ovdsfagiid71k8t5/10898201594.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/meginaxalebuvigigubin.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f43361ac592---64755082875.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b42236e7---midivoxurusaxijewagikuk.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/68750446781.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/negowoxefolasawula.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83a3f238e---94539194392.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/53823934344.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/41437qltdqu9ribmidsk4qhhj4/8089759955.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/961e01aa5b47fb39f2bf7ac5c4ab3cdc/nopiwetodemagokifiro.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/pepofujijizeza.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/96931088603.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/82561022379.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/torazowefuwumanin.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bozeduwupesivanumenud.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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 10876 bytes
SHA-256: ec27adcad6a486269aaaffb3311491ed887b7460ccc2f74d4d26db84d3b98647
font_02_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 18260 bytes
SHA-256: ba271060a39f64eb89bb29566dcf072a2bae8da087806805b113902683b2e92f

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