Malicious PDF — malware analysis report

Static analysis result for SHA-256 51046e7e2d287c48…

MALICIOUS

PDF

71.1 KB Created: 2021-09-11 07:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac0f113f934c12f283e8b928c15ecc0e SHA-1: 2dd01dc0ca8e2e7754ffa337db8d43bc7a017ede SHA-256: 51046e7e2d287c48ec86a76e0caf4c43640568db180f00363f664fe339ffe37d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a link farm and a lure to install browser extensions or updates. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into downloading further malicious content or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chiari-web.com/ckfinder/optimist/files/53966048662.pdf In PDF document text
    • http://be-now.pl/userfiles/file/rezosimu.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/69699734968.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sotewifibomidoji.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/16579811097.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/rawipejus.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/buxut.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/10977226575.pdfIn PDF document text
    • http://rooptex.com/uploads/91347091330.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/79434680544.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mojori.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/65893017188.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/85776618772.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/rirezuwa.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/38018204037.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130302254cba---84106490883.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/54394621284.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5b91dd5f---43207692877.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c748e6e37---17721508868.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133465d042a3---nunobugasojoxokukomegusu.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/mesasamuzasulumemawovem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+fix+app+is+not+installedPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/mawekitifuwixut.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_off0000b62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 10572 bytes
SHA-256: 39ec5a641043f52a05cc5a230140e03c362d40baf5b0dc6ba3344c1ad3e8949e
font_02_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 15708 bytes
SHA-256: e3ff26eb632543648ee64dbc51770084301e0c3b5cb98eb4185ec89c6e56a098

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