Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf27644c5c6e0557…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 02:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2ac5314bdbc3e52bf74e33845795332 SHA-1: e71379d88a2ce2359a5fd7a7d369b385c9978d11 SHA-256: cf27644c5c6e0557fd844bb2a489cc59d0b3cded5318f9061a6aa2d143f2672c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using link farms on potentially malicious infrastructure. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stormester.no/files/file/nifulo.pdf In PDF document text
    • http://brukikostka.pl/uploads/page/file/deregimirasifiwinexasif.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/paxituzol.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161380cf3c52ab---22140382492.pdfIn PDF document text
    • http://slovoveri.org/userfiles/50310469691.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/66768546710.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/pitevawutovesupiri.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/bedikiburobabewutidovemoz.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece4d4a572---xazededekesesoxajat.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/fozozirukaxik.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/lomolupawatezuga.pdfIn PDF document text
    • http://deforma.it/userfiles/files/20102006534.pdfIn PDF document text
    • http://benetalent.com/upload/files/41678948702.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/benujotugojep.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd76e982f---72220871793.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/17494627594.pdfIn PDF document text
    • http://osayit.com/images/file/4524876607.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/puxitenofitubotilebaw.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/66872210097.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vexeseje.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/kerogamegopujekube.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/74868205623.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/52130253461.pdfIn PDF document text
    • http://djapm.com/userfiles/file/mubado.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/53242405757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=play+store+slow+download+2020PDF 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_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 16412 bytes
SHA-256: 5d3f64c29be60cd2113a9bd48bf3ae192c879e8f9497d5849b28c6ae1f90f447
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 10592 bytes
SHA-256: 5d60f4025c615f3ceee236146e37fb7148ef60d4f63ff9b88e1294f875da0be0

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