Malicious PDF — malware analysis report

Static analysis result for SHA-256 08224feb873f176b…

MALICIOUS

PDF

145.7 KB Created: 2021-06-26 11:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a588f7bf7a2daca639dc34414badb55 SHA-1: 1b9425e9cb379a058c451887170444a96c9aa492 SHA-256: 08224feb873f176b2062587306b2a472e2f7c044174939aa51f5bd93c60889c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://allytemp.ru/uplcv?utm_term=what+is+it+like+to+be+bisexual PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/uiptcedcfo173rjbdf72arvl3h/66009705124.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/78348589074.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/96540945444.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c42bb9f72---wanerem.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7cd2c1f9f---47081540659.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98fdb7667---zasavevo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2358dd8c99---16379569897.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb19c6b7f---98136372695.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/texonofiludag.pdfIn PDF document text
    • https://menu2uplus.com/images/file/47527457771.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/lesip.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607139ca7548b---59547553288.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/lulifejunibipadonekaxawa.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4a0b7bdb6b77915dc3574781201cb973/dawijor.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ec4439d2---risolinimisilazinevin.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/86018717655.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/zazux.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/50914643578.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e896057a---49702656563.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/f4viqqojgfl6v3s6r4aq6nct29/nafusorefozavowevokivovob.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/pikisokezevilemorapumajok.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975ef19dfca---lelaseralunutekumefebinez.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/1769963844.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32751d464---48224702245.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f75e1ebe---66858409964.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_off0001db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB74 10428 bytes
SHA-256: 52b64f9519c63d22f40a47ee1d45ce56d6483bf055eb75df6693382828f5c61d
font_01_sfnt_off0001f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F342 18184 bytes
SHA-256: 03c891899630186c8e3db40da73ac9f2d9645e634ff654319741927979c90c74
font_02_sfnt_off00022202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1