Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac7a367ef974888…

MALICIOUS

PDF

102.4 KB Created: 2021-09-05 21:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa4c74c45155a41d54214fd816df09b4 SHA-1: dfbe0d5be2789c429a96dced4bbf1bf7db5789c1 SHA-256: 8ac7a367ef9748889a87c6b14d7e6e48b743a161743190274cdadecdbe9fe484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9732

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca49cbe8be---22786950474.pdf In PDF document text
    • https://zlatartopalovic.rs/files/33416868434.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/71921926200.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/gusexopewofafagevar.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/64529113503.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b266e8b5e8b---56721664392.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061012282629.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/23580602161.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/j7j7buh9aqh3k2aqn9s6v1uggn/regugorudizenomak.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c66b2c697---42143370460.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/u3p54cmonlntrc9tekmci6jrrr/75036876494.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/wubalazepozobofeteke.pdfIn PDF document text
    • https://coluer.ir/documents/file/dikilanufurururijal.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/buditagowanezaze.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/18910102591.pdfIn PDF document text
    • http://hotstamping.pl/files/file/wenegavupupaf.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/virupulufemi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160827aad3eb32---13011498017.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be90d1208---nuvuxabawitibopeno.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/62426031843.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/mububosulaziwidawab.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/ranuzeboliju.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/pibovuraxunirilisivov.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/d08hjflu9ijgghl8vsle29j4sn/kejanojuxebivebowajen.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16099bc6cc0917---77685660730.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/93321969178.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e57bfa9efd---71187169798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=telugu+academy+intermediate+2nd+year+zoology+textbook+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 16248 bytes
SHA-256: 57df2f5f2d89c8a447b4a898e550446ca69902305a899d63ce18cc1cf281e4c2
font_01_sfnt_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 11488 bytes
SHA-256: 7e830e2c6050f350117f6bfa84f575ed9a4ad5b6ccebbb574150f5465caa7463
font_02_sfnt_off00013674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 23140 bytes
SHA-256: 9cc6e273f83f37b03da1f1f0196f76367f0c0dc031650a0a624309860f0723bc
font_03_sfnt_off0001724f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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