Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d1b29f446b9d6a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 16:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 610c935efc9449bb73a98cc3abcc61ca SHA-1: 94a39bf4a6b35810f81a355ff6f329c424aee7b9 SHA-256: 47d1b29f446b9d6ae279cf1bdc5215332f008229bee7aa6abf25860a3e3a6092
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised websites and other PDF files. The presence of multiple 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly indicates a malicious intent to manipulate search engine results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://residencelesaline.it/userfiles/files/xajavojiwifinizizivifa.pdf In PDF document text
    • https://aradmissions.com/ci/userfiles/files/galadi.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/vokutenarapaxupamozirukiz.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/xagimozalumegilexu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613926201f3ab---kikuped.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/72300157596.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7a2210af07368b4d35672c5f35d8db8e/gafabek.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/85998376807.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26e71e65c---xelebokuzezisixuxonisa.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398edc56db1---wufulodi.pdfIn PDF document text
    • https://yifff.se/userfiles/file/pumokesarozudi.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/dapidaruri.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/31216402574.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///vunitukez.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/sogidasexilaliziz.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/14540716766.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/nupazutatepaxunezeti.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/getebotil.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/bimofobilelebijasu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45979322717.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/1626237825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+studio+64+bit+free+downloadPDF 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_off0000b8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D3 15800 bytes
SHA-256: 0d1363b11da4cda2f81037a984870e8545eceef261082108ad3db397b45e9141
font_01_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 10900 bytes
SHA-256: 2d5be06d4e850a1d87aca0d32a7ab6697e05cfa13e507b433909e232ab7692ed