Malicious PDF — malware analysis report

Static analysis result for SHA-256 650a63b2f30126b0…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 21:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c5b153d9d541b0a8e8268ab5e830880 SHA-1: 2375edcbe734b86372875de14101723d8d3f89c6 SHA-256: 650a63b2f30126b00eb38b4186c2827a17a43d2f25d27d1c6bf0e536fa5c14fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI links and a link farm heuristic points to an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bhavalaya.org/ckfinder/userfiles/files/jeloradarares.pdf In PDF document text
    • http://asckhn.com/acskhn/userfiles/file/letusevifejiwidifubek.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/16aac46be07ce01d00658a5edbf05d2d/xakewomavoruna.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/jitafigewidurazikogiwov.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/tutugufulilijuxaboboxi.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/391117fe65e697ba33d0afc1c3119408/nalawisimaginibizud.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ce8155da---80175233588.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/gafuledopugexubuxuviwaraj.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/munerisimutesinaguwizuf.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nujapubipev.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/pidudilagimigamaneleja.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/sinimemeluba.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f7e5e379d---bejabetal.pdfIn PDF document text
    • https://tavio.ru/files/file/kukufowab.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6621364e11---nixudile.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4masln58iivd478svvqc5r7f8g/8450801624.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a16515ceb---67425863375.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/oc5f8u5d5terbfdjbq5r6j0u14/nurafaxenojoz.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/94913690092.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/3f97f1865f976bab51051c5644f95c79/21087885052.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/47968174413.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/2h7kemh9521p7bgngv7fb07ceh/jafexaloril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+halloween+writing+paper+pdfPDF 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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 18820 bytes
SHA-256: 78a24d63d8ad4b7106b6456fc7380869a0bfc0f1dd1fafbb71f7358c163d10e7
font_01_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 10672 bytes
SHA-256: 7cf3c281c90a5c4798f82cdb6b2ec44c10c2790338c898e110c5fcc83dc75e96
font_02_sfnt_off0001380f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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