Malicious PDF — malware analysis report

Static analysis result for SHA-256 576afd02accb2ef9…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 19:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f9c3c59b1fed6a19b169c8794802c7e9 SHA-1: 0c51ee5786a3cfbe914999cc56a9a08b1243b1c2 SHA-256: 576afd02accb2ef9eb126158bdbd551554affadc1ff76531bb527f1549db6793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or distribute malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://luxe-pools.fr/i/File/ferasi.pdf In PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/mufinapujizarunuwomasola.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/f703366ba6d970bf7e9804f21af00f47/korekipo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/52d43442262883c45d2be82bf1aaba19/60799615879.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f10d6866fe809116bf092eb9ec0e3ff6/59910220344.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/70669985983.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29596516240.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16102b0412835b---70269815521.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/tawitu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748ce9ea7b---sisisulibewuk.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/gifimuzubutadi.pdfIn PDF document text
    • https://tomas-music.com/contents/files/61502202306.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/perewuzap.pdfIn PDF document text
    • http://ipceurope.com/assets/file/jexuzadil.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/10023020363.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/83397864683.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160923edc0d705---medobiginuvigopawimeda.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/xuwexexaduwadagokeferim.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/wuwavixujetitu.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/wavosexerif.pdfIn PDF document text
    • http://mousike.it/img_ins/files/xodadevi.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/nelulutefe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e0aa45ee2790fc35b4ac823073726f87/wigagexaxotopofogoxap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=odisha+government+holiday+list+2019+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_off0000b390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 15240 bytes
SHA-256: ac4e310dff9f6711931f2d19582d589b957f020006e1e76777a534636fcde746
font_02_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 11612 bytes
SHA-256: 0efdd3cdcdeb02d846ca67996612d8505dba7708e516c154324c0caf067f8004