Malicious PDF — malware analysis report

Static analysis result for SHA-256 053f6fb8b4cf6710…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 17:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09c0c92f1482f207122452c750771302 SHA-1: d54fb08a8dfc96f01e7cc1f3f6c10d461825d09e SHA-256: 053f6fb8b4cf6710c4ef9d99eb8124bf7a846fa2e070bdab4eb3c3e9b2ede5cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to files hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://abnicum.com/files/file/rewin.pdf In PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/5726589887.pdfIn PDF document text
    • http://ewtch.com/upload/files/rifapo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311da7d7f57---xunegemusazunex.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/mopikotifagogexatu.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/36961341982.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xusofipeziniditezile.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/suzojutomosubolo.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090812041173499.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/79540647794.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c6f6cb39---judon.pdfIn PDF document text
    • http://runbo.net/upfiles/files/1631283620664.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/mibuw.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/waguwinonobijin.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/51677586881.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ad20e94ac---7465967288.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8e3nulcmjnoddphmso0drthi2/nawuderewasirimexawu.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/43888651176.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/61766985800.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/13010620565.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/62350946578.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35623b11f---93155323434.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/90573045114.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/900971087.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/suditeges.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+block+third+party+apps+on+androidPDF 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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 10900 bytes
SHA-256: bb217e1f652d8ae81c764051d606fe44f5b0cfd401b34316f82731a1627d0ac4
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 17228 bytes
SHA-256: ec6d28ac72e7160208247a9d2697fcb8e77c95866dfc65e77c22ce008978d7d8
font_02_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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