Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad19c63992587b0b…

MALICIOUS

PDF

134.9 KB Created: 2021-06-28 20:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 558c88eb298ab850de9a0b73abf94ac6 SHA-1: 5cebf04a31752e4ea7f8b453257bf841437727cd SHA-256: ad19c63992587b0bf1d1e4694cbd1ef44630d16ea07c485dc392ff9cbd6939ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://bixenony.com/userfiles/files/zazovitegowunujosuwubunu.pdf In PDF document text
    • https://m-isc.com/userfiles/file/fiwapapewobawerokijinuj.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/96db073db6cc37c1085ce03ff3f61218/42515644393.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/h4nt7hro87g6ro9km125vn69hn/bixawedalo.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/31668002490.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a44e1e0ef---nolazikikevuko.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c5eb3383c55ceff6927d5ae445a34aaf/sukiligulofovuxopugi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/148f452685aa744cb89f37d515804612/60032028073.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/11094000525.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa964de754---tufenolitotojepiziva.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/pibefewafurafixe.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/dipidowuruduba.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kakeguximavexowokonosegel.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s6h8kdeholmsouk60a67jeppc6/govaxumefegiwisalabadiwu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/diviluvarawebi.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/nulojimaja.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f34e3ac8ca4b2ddda7d2ab72a6cf1499/42264978174.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0777b7eba---1924925070.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bacef6c8f11---tigexuzotedemogi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/bogegovatifevafakufurirun.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/75302874674.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/a354di970sl5km2aoaul8ungnh/gawamejubukapo.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/64947407487.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4b26ed00---22400343042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=after+school+programs+near+me+for+middle+schoolersPDF 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_off0001ab6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB6B 17792 bytes
SHA-256: 249f343dd17ba41f8b6a8f3ac2958cdfa8d8d0f98c57f8e25ec8772df295e84b
font_01_sfnt_off0001d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9F7 11048 bytes
SHA-256: 1a49eb638d015be49ab2724342f8ef75ab0e1863a7a3d3c5f581c997414749e4
font_02_sfnt_off0001f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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