Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fbf0e6dec27ee3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 03:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16a0420dc6a1e7f2583f086a70f0c973 SHA-1: 1181c0b45ba6286a66c14677d2e19c56eddc3edf SHA-256: a0fbf0e6dec27ee33df18fbcc321eb7b152c5310f9d574a722f9db0dd2d93f2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised websites, potentially for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74400221663b89e735c03b02cdb9a2f3/82269995378.pdf In PDF document text
    • https://bititechnika.com/uploads/file/kovabajelitejojuditesodi.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210504103210172.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/m61lod3ie8maao8ane6b9m0gia/52433545492.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4rdof7nbfjdsu9pem8ftjiva17/lorijinaxesewepomerukema.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/gegataxeposuwuxodofegum.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/6491942376.pdfIn PDF document text
    • http://prosquash.by/data/wugetozajoropire.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/32893917540.pdfIn PDF document text
    • http://trivio.it/userfiles/files/79495973394.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7ff51c5af---xababumajizokavolowe.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c11ced4c5---makilewevodego.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/kujanenujuti.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/kiginasewivota.pdfIn PDF document text
    • http://packamate.com/userfiles/kivifevenugu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lcigoh46om3hmp7p6qfauu0ien/rixudu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9842c798---webeximoxof.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/59000260026.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/gaxupotomepufegu.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/42449671259.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/rurisiporejam.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/53609232711.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091880500381---kebuwasawozugogolubozo.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/30467396788.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/75606518375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=compress+pdf+files+sizePDF 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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 10388 bytes
SHA-256: 72bf3006154291dd3de6865d91edcf08b887d142cb73e5eaed4fccad43a01fa2
font_01_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 17352 bytes
SHA-256: 7ccf4036722f673a0ea6484963388759486537e5c3eedcbff9d66655fc4147b8
font_02_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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