Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2784d654a172387…

MALICIOUS

PDF

93.3 KB Created: 2021-09-22 12:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 18f7b915ac468dadf373b1ead2062ee4 SHA-1: 6d4cfd7b52aca6e8cf28494d14d5167492d455b6 SHA-256: d2784d654a17238748610b9854b88a22f411c483f413ea7833f57e1a86198197
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, and contains embedded JavaScript. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into providing sensitive recovery information. The embedded JavaScript and numerous external URLs, many hosted on compromised WordPress sites, likely facilitate the exfiltration of this information or the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=rsa+fingerprint+android PDF link annotation
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb25ed3139---17804967057.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/60652487770.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78398d104---tojares.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210907103651.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/roxevigixizusafiki.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/mewomusasawijilofedoruwe.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adf862d726---38195924035.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/nemoz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d28d31eb0---87296832279.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/vorusofidedejuvuxe.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/55368506785.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/jedajufo.pdfIn PDF document text
    • http://gwynnoak.abwingsmd.com/uploads/files/2446272658.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109111550532779.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/xigove.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/kupokirinotedebo.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/88138893030.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/92971439122.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/57402243695.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/8502794927.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/80490821743.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb998c34ca---bugowegidigakuwewonidibo.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/xemanejepulovixave.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/jatifoji.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_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 10672 bytes
SHA-256: 0868e42d476b0d5bf0c5605ef79133eb8a7e6d832da38e13cf94c1276ecce787
font_02_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 19184 bytes
SHA-256: e3beb30521509b78860e79109e47ec4cc318fa86eaf0376c59d8a133b3e7d235

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