Malicious PDF — malware analysis report

Static analysis result for SHA-256 1669a758ff23a921…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 01:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b618dab6327eb2de6094cb50ff7b97c9 SHA-1: 9a1f41287fb69753758da291aa384b379fb95401 SHA-256: 1669a758ff23a9213ac5d537373893ee2159b3857166059faf11e78cb880ea2d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://queure.ru/uplcv?utm_term=intervencion+de+terapia+ocupacional+en+autismo+pdf PDF link annotation
    • http://pogservice.ru/userfiles/file/gusiluleworawupati.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/dutilal.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/15265858400.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/52397826354.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff856e454---62039324652.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/vchkr9erv8f32ee4legdrmktdo/58796079928.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/xutuxizobepanolusebiw.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/be8c444c85456f396685d64dee2d8fb6/44679769380.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/e6vn8ge8hpds58pa9ekf9u5flv/92474355249.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/29744082620.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/80392159018.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/49471874893.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6594a9dac---numodedigogotatebu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/puvonidewaga.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c183de60b74---78221917705.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e77a2f72---80948080629.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kuxubuwa.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/fujumiz.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/76942893564.pdfIn PDF document text
    • https://bonacorsi.it/file/tukax.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/bezewejisukebizikako.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/17749096662.pdfPDF link annotation
    • http://mitsubishilongbien.vn/images/ckeditor/files/37056120469.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/puveditakufuwa.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_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 18696 bytes
SHA-256: 5f385c62ac1b5db9b9a93f690ee36c5aa6d96246795e57dec312d08496a3efc8
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 10896 bytes
SHA-256: 59cb673f14da8b9a239b5b34c2138fce27f656a19ec3de25fd612dfd72e18fed
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1