Malicious PDF — malware analysis report

Static analysis result for SHA-256 f552ac7370354bff…

MALICIOUS

PDF

93.7 KB Created: 2021-08-22 04:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0baa96c3de3720e17953012cf1b1e7d0 SHA-1: 9518c0468275c4834b43157240fd5d7638108ddc SHA-256: f552ac7370354bff5aaadfe9004f65da8a74ff3f6a4b73aea77faf29a41c4a91
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. A key finding is the 'Browser extension / update installation lure' heuristic, suggesting the document's primary goal is to trick the user into downloading and installing malicious software disguised as a necessary update or plugin. No scripts were extracted from this sample, but the embedded URLs and the lure heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=what+caused+the+russian+revolution+of+1917+quizlet PDF link annotation
    • http://aucoindeshalles.com/menu/file/wilekapejosiwalobaz.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/83354546555.pdfIn PDF document text
    • http://promador.pl/userfiles/file/43822708397.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607212a10242f---vusamaselo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad05482d4---23835228473.pdfIn PDF document text
    • https://zzwgjx.com/d/files/wevudokusasik.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/lavazilu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/njn3u1ng48bthppsk702d9kai6/97941678935.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099e509bcb31---xixom.pdfIn PDF document text
    • http://citra.cl/userfiles/file/puxumozumakojokak.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609222b01cb5e---zinovaviboz.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/20264827345.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/51437685342.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/kaxodawugewufos.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a6affe1aae0eb8398abaee4296622853/70502686487.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9851ad09---jajivimikinejaxafamazu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099b734e60a6---larizat.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fewijajikoposajowavi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607772c5b9f81---legefijeranuse.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba2142b9f---94650347384.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/64716fe7f402ed7e7ce72c2a251c5f0c/41785079405.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/dset9a68ghd77tsl16rqg03efl/pekalije.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c27c124fdae---47552888303.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_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 17672 bytes
SHA-256: adf6decbc913fe578ee29126e43495e002733f93b60a1f3442b0c6258108ef12
font_01_sfnt_off00013689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13689 11208 bytes
SHA-256: c2cc3a7c030f477163268252499054c2f1f4f9d6b6cfcce0428677a476980b54
font_02_sfnt_off000150bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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