Malicious PDF — malware analysis report

Static analysis result for SHA-256 9163253a224c9c4e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 13:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 301257b98c4e91179301bedee261089e SHA-1: b846593a840161bb444aa23801fc0cb16272e28d SHA-256: 9163253a224c9c4e2a6a26f12fc94020b78bebcf2b8d1356118e30ae14ecacb6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the ML classifier and ClamAV detection. It contains a large number of embedded URLs pointing to various external websites, many of which appear to be hosted on compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=dual+messenger+for+whatsapp+in+iphone PDF link annotation
    • http://3suntech.com/UploadFile/file/20210904025358763.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/19017771238.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/83008687484.pdfIn PDF document text
    • http://contelex.it/userfiles/files/35912858573.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109032219038212.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/80954934370.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/92537656564.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/152d6d3f7f67f657f4a9aea037fe6882/boxebuwulexuserapabax.pdfIn PDF document text
    • http://ubest.ru/images/file/sunagezukatagixag.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5c29ec84---bolapopoxefaziw.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/50452531748.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/zafipotirexozaso.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6a6692337b9b9cd4269b58a331a03cde/kutazigeba.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_E8A4ED4B38408460.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2c930cc1---komufozup.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/natirove.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zetoxewonupizadanuf.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/21066544430.pdfIn PDF document text
    • http://baoveantam.info/upload/files/daziwojobezuj.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/6972226120.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/25371401750.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/sikizuji.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/jefivupi.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/75985743473.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/65938526648.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/89065429910.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_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 10992 bytes
SHA-256: 352c55c22f872a220b96e2a60c629a038d0ee2200c3db8c15143b2d35588081d
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 19836 bytes
SHA-256: 2966b348d99c19a0ae03713e3334d247025af3b451efc1da081ed6f99450229b
font_02_sfnt_off0001235e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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