Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa5b32c9e4358c7…

MALICIOUS

PDF

94.3 KB Created: 2021-09-06 15:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b29d8ae7a098345ad6424b71057c6b5 SHA-1: f72ba46e10b6e6a53958e9613da74ab537b2eee4 SHA-256: dfa5b32c9e4358c7c6e2bfcda6e92ca94118f52b333f5f035003c8f55affff5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting suggests a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7189e2df51---36545802128.pdf In PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/13451025711.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/64361145256.pdfIn PDF document text
    • http://skomi.ru/img/files/file/69898486375.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/jesusukujuwasol.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/971a14c0003b1b3e6eebc1b9148f82fe/bozaxefadizabavupawaxe.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/voworabufalix.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tagurusinerupiwapo.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/75160970281.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qvsj482qo8f8504461kjm2aoc4/xinimetupipugudameb.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/turifavol.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/06d47e744b09436d6ee782a158c5411a/sopulurov.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/61521509317.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109012027395685.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ac3b6e89---bolusoradejorukugenozos.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2094ca5a---57730196173.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/zotiru.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/dimapetizinomimasi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/km751c61a6seef1gjks1he71mh/9347681885.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/46630525506.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/41425278302.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7b24hp01jnvnbm6t92ovrvqot7/3460430332.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f332a41ae56---28930711967.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/31863225333.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xukeduwebitiriniza.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2231cf99f---zogadisipobezizezivafugoz.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6811cea61a---rumabarajavapovi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff431d05ce---ralezadegig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=appcoda+swift+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_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 10296 bytes
SHA-256: 4c49660fb8a1d35bb01ffc5a9a21ec80ad2b9e5b75aacd864ebdf93e62ba098e
font_01_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 18584 bytes
SHA-256: aa8b8f8664efaba1e4d2d149a9a4d6d1a91eeaa59bf4a27e1d2da34039c89b2c
font_02_sfnt_off000153dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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