Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f09682fa5c74e0c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 09:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79765eb5fdd5aa5e5db4d61397e3e404 SHA-1: 4a5fd4fe22d25fc5b3422c160b57aced6e2d6df1 SHA-256: 2f09682fa5c74e0c38fd182b846020e79d0d4b6dac459a5d3db4ffb219d4dad8
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. This suggests an attempt to lure users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://aalatour.com/basefile/b2caalatourcom/files/61523692398.pdf In PDF document text
    • http://erainbowrealty.com/userfiles/file/678209741.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/78118132983.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/61253849276.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/digunigoliposamesukekena.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/sagoremu.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210911081009.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210901203520.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9idhq59qa458f2ahql6541fg80/12277697675.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/tapuw.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/3412360896.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/vofafafunibomuwobuwan.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vafewipavisexose.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c44ad94cf50971637ed50dc7f6a0a58a/15644380740.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/91035064206.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/mepus.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baafad376b---42083492079.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/rimimuvokomuso.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/depejogakabususejemivodek.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vozojirolotetafifufus.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090411000038.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137970366696.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/xijok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=app+windows+su+androidPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/11752457109.pdfIn PDF document text
    • 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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 10276 bytes
SHA-256: 8493aec087a4dceb6b52c967347064554eb384351e34a99191f95e23c4796654
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 17084 bytes
SHA-256: af261785cb915fcffc74deeae8019f9664efd0ec34260ade9f830331de5f66fc