Malicious PDF — malware analysis report

Static analysis result for SHA-256 d049a22cf0eba9e2…

MALICIOUS

PDF

82.8 KB Created: 2021-07-18 22:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 64079bc362a65d7ac633e4133772fa04 SHA-1: 25cb472d22dc8455f9f10d6bff647d4fa03eb5c1 SHA-256: d049a22cf0eba9e225cdcedc8a83eb1f0ddda291f1c7456625b696bd6d6d76af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0muo70r59n95bvq9qehoqf30kl/sovusepu.pdf In PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/zufafejarijeduwavi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160885e9e480a8---kamugin.pdfIn PDF document text
    • http://vo23.ru/upload/file/bimejegiw.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6m65si2s30srecc4jsetmdtn61/wadunapapesutefawuzesube.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/rodozepilaxatelivufip.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1770e1c91---xivarajikisowinidup.pdfIn PDF document text
    • https://mihalex.by/files/files/85907737782.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/42570117120.pdfIn PDF document text
    • http://accu-split.com/userfiles/files/84545449939.pdfIn PDF document text
    • https://spark-care.com/userfiles/file/dulofumel.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080a66aadbee---12056558148.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42594c2552---50194881359.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7400c3dd88---31903742779.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/14767715579.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zejarakutagelolasawuman.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vekedotewezafetuzosafo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bffaaa8cb---fipiwusopunuromosup.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/727bb700f854dd8e95a7657d5592d9e3/boniletiwafukagonojit.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/69151776299.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/47991599818.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/58160207345.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6a091d6902b26aa7f9ef0c12137f2a32/28951887751.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/0d7f05321899f6c0e8ca8d43cd1b9284/bagelubozoduwikez.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e5dd54f9---54900863683.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7f0ab0da0---90520041165.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7c2e898028b4fdd084b62a8dcf03393/13498740200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=constant+angular+accelerationPDF 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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 10536 bytes
SHA-256: 9bf7f4932a84441ba3241c423a13e8fb229d68a03789c3e6e3c2fc878f1ba730
font_01_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 17284 bytes
SHA-256: e9ae4a5c36d70c7553ca638be5e15d23bf4662f546e6f4d5a059e5aee679de77
font_02_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1