Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b1dc7f71deeb59…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 01:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e25e2a2ff17ce1337e1b7bf0db70ab1 SHA-1: 4718099818e651a97f3027148b66f4dec7bdc462 SHA-256: c1b1dc7f71deeb59a2a38a12a3c412100e2417005d1c42c0c73b176884a14f29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=temple+run+2+for+android+free PDF link annotation
    • http://gizmakina.com/depo/sayfaresim/file/86499771970.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/14650481519.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/wowebugowevogamosudipime.pdfIn PDF document text
    • https://slide-bearing.com/d/files/fazixudo.pdfIn PDF document text
    • http://landpas.pl/upload/file/diwev.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/36601581487.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/21358600960.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/87647707173.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/98737235288.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/60283489698.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/joviba.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pva8bo6vhmoa82dha7jd8ecv26/furexoropulefavu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/77808e73e02bfaf314cce309fd714c5d/gisaduw.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/76266228729.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/3996558868.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/nomubikorem.pdfIn PDF document text
    • http://rurisnet.org/images/file/88621864718.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/1242463191.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382895214ff---24430754017.pdfIn PDF document text
    • https://apra.pl/files/file/zidurulovufibetusugo.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210905125057.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/tozis.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210913081559.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee06dc973d---41936300414.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/51718890993.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6a116e1f4013855bf0dc19cc8178cafd/fusilijivibiwoluxisi.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/folazomaseburesugobovem.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_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 10576 bytes
SHA-256: bc75b9c2bcbd39bd31847f447fd86dc5d38b93502fe4b86813f479f6718c6244
font_01_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 17284 bytes
SHA-256: 0d7302afae327ca347fc00f82002857b3d9ac5080de9d2c8388535816f4a4dcc
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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