Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb77cb5a378fd62…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 08:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2957f710f875fd07a2fcd412795037e SHA-1: a5ba614a2dd278e60577ac8ce314ac9e58120127 SHA-256: 7fb77cb5a378fd62f095a1ec02f2511baa1c26cda626d1857bd104c8f1505107
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://winfielddeli.com/ckfinder/userfiles/files/pamefofuwilujipan.pdf In PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/53429573552.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/71868157478.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e868cf5c52ab45ffd7d3f6465c076406/23764973060.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/vatubudaguwupevasupe.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/dadodode.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/5612qjss88lqqu2qe1a4b0l994/jowamufatoviza.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/30649361281.pdfPDF link annotation
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd774d17f---42226184432.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/67344221210.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/94008070460.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efca5ec297---8509719144.pdfIn PDF document text
    • http://benly-carson.com/product/files/foludixiduxokopogumes.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/tanadujarurovanoj.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2fe6d7f9---ralilapa.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/43503094905.pdfIn PDF document text
    • http://twilaw.com/files/files/mugasemurolenonabavuxifig.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/jopotajiletidalupozawev.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/pupolelepekude.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/puwolozidevuwiruravop.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad611b9c8---84453275613.pdfIn PDF document text
    • http://all-premium.com/user_file/files/43805880317.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/xogozulenavuniravej.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/57814713327.pdfIn PDF document text
    • https://landi-bg.com/images/file/85142532107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=run+two+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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 18776 bytes
SHA-256: ff963e2a43144ad39b030fb5e80d08ebd5d24cadbd783ea30fa4229f851f1a57
font_01_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 10440 bytes
SHA-256: b4d8d9e6a4010b9cdbb45c463faba154347c2fffa8e1af62e2924e02d95fbaa7