Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aca67e1367563b…

MALICIOUS

PDF

94.4 KB Created: 2021-09-06 12:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 38c10bf0701963ac3dfc8762c5d9d4de SHA-1: 94772b4663510a524f2d7032fad000fd292cc997 SHA-256: a7aca67e1367563b3d11d2e7c1a5f2bdb62c9ce7853c8a8b5553405b678ca57a
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vmkmsz.hu/userfiles/file/xenipepolipozowubemedaba.pdf In PDF document text
    • https://goodline.by/userfiles/file/52285961552.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/vifufokos.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/9826629638.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/95018b92afca1e34bec68bfe91f4e3b6/dizekigupenezaromadufinu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a1b2f02d---29887484224.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90a2832254---39382338183.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/nufosaxefagukeritepemes.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d192b825a65---16237407221.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/1182566252.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f020ccc272---54065354919.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817d2010491---97031650551.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/nugk5109nnhf7jrjchb7kfdr45/keragijoboweponowaje.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/ribigexamuvedukidagaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161111c18150d1---fufesokusodepevimikovovos.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/ragewasanonirosapab.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/16858738870.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/reratowezizoropine.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/marawitemop.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/72843210604.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e2230d8acdb760df3b76b4e22cfdfdfe/93443653163.pdfIn PDF document text
    • https://maisonforville.be/documents/file/87082517629.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/85135265038.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/88929ac9d519486292378ee5dc3a9b13/26391815508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+surah+rehman+with+urdu+translation+pdfPDF 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_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 10948 bytes
SHA-256: 8b3a96ae83521fb89ba5f5bc36d028d42a3cc01afb00d7d117ea8225b3673f16
font_01_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 22632 bytes
SHA-256: ecfb8cc1535849ff10912dc65ea806553231f76c08313bb2631c9a65330c4447
font_02_sfnt_off000153e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1