Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ebb599a0332968…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 01:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1a3c31a058a62de08ab186f275f97dd SHA-1: b726036477eb2d245bbc427ca0e198bbf054d9ae SHA-256: 67ebb599a03329687db78fe77d4804a15d8e7db9856fe9f694d0ccceb6329e05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to these compromised sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worojif.pdf In PDF document text
    • http://sarljarry.com/userfiles/file/77867310158.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/geu0k6ck8jel490iln60p6sckf/jixitasar.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/77329862362.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jalikuronujixalenusenomog.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092869315c4c---zijowo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2704856d0---73758610478.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8f49fe07---jazabijilinumefijawajap.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/fezewusazadepowor.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/miveduvatawip.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/77180431297.pdfIn PDF document text
    • http://kdekdyjak.cz/data/zidoxebulukaxajos.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/1518329472.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff4ba7320---17777034406.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/80677868719.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/xoginesikego.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/wuxalivaromemirag.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/6554043373.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e1f39f76e7709fe6112f9bca2ca29803/lumidir.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66028193b---38051316579.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/96099039777.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/86243522067.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/7kf30n0ehh0eqsr87q5aivm8ma/jitubulafiwika.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ea6d5718---pemosagofajifusur.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c239864c4b4---pubewopabemal.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f3f081c61---zemetazaxogosusifeneza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=parotidite+viral+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_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 19516 bytes
SHA-256: c340c0aeaff6faec88fb3f0928e1fd0a4644d59252541a20b438faa2992f0817
font_01_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 10288 bytes
SHA-256: 378e548376377dd52714913ebd16a9e12bde7b1df75d87a78158d92c2e7473f7
font_02_sfnt_off00013a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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