Malicious PDF — malware analysis report

Static analysis result for SHA-256 942f190f77685668…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 04:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 22d28bbd9e1609f7193cbbb04215bba8 SHA-1: af8d25742a391baeb4206f05b049017b422ff18b SHA-256: 942f190f776856686e8553a8de8826edb6c7d4c0de18a38637b48dc08dc12e42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://oniceh.ru/uplcv?utm_term=attivare+assistente+vocale+android PDF link annotation
    • http://lapenya.cat/imgjovesnaves/file/rijadupisawerav.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/15900939678.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/52282826798.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/5220253738.pdfIn PDF document text
    • http://uchid.com/uploads/file/tedibot.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/zapepal.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140127c50254---71467030468.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35054989150.pdfIn PDF document text
    • https://paperland.bg/uploads/file/badavosodofutete.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/99239792872.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/binoxotegilibi.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614288143f5bb---safipelemazowizezinexipa.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/69443862300.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/27791711408.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/totofuwopuvo.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5dfea9c4e6a1c82c720259017e39bf58/pevezukewu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161432c80bd346---nerupefigezewigulomal.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/lezegixugejomukeka.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/16650940962.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3fb499cd6---12623371139.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210914123730.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/geveputobibufe.pdfIn PDF document text
    • http://hanifeugur.com/image/files/74958284928.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/zabetifumorapemijix.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/xeduxekegimujedanoluxes.pdfIn PDF document text
    • https://tpk-m.ru/files/file/jofubemorofor.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_off0000b5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D7 10408 bytes
SHA-256: d47682ee3d3d2db8b92d356d86356bebcc162cd18ada8b38405201eaad792636
font_01_sfnt_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 14664 bytes
SHA-256: ae89efeeec2fae6a816b4572db1179166c7c7217b7fcaeb83901b9a9472cf0a3
font_02_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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