Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac25e06aa92ec599…

MALICIOUS

PDF

77.8 KB Created: 2021-09-14 09:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a8773879bc63293469996688cb214957 SHA-1: 0be8a1574b35121e303212dd95d3bcb355ce78bc SHA-256: ac25e06aa92ec5995c95fa1879784691afbd8691a5b49e63e5a2defe594a7b54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to a variety of websites, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic firings related to link farms and compromised CMS uploads further support this, suggesting the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=all+in+one+adb+driver PDF link annotation
    • http://hacoauto.vn/upload/files/76033803656.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/xanoparixalarimo.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/rizalozetujebo.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/67427829765.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/kurixuvuxefa.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/96478993259.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910220252404020.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/76261503824.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/jepizepodutabisadeg.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/dosufavogiruf.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/purozatosi.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/rejojuge.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/luwelija.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/xijimelasuzew.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/14880884112.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613880ed3580d---vugojizenajabusinabazifu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pm040atic8hs9feroq3gclbb57/foruwuvapopimotej.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/gevelenejusaga.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/18809664364.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/dodexeju.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ebbcc29ba84cd23cdfa2227ff4cde980/dovonedesefubatajeg.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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 17592 bytes
SHA-256: a403ba3cf93e2f610b565c735495e9450b77cf0392333f51f60ce92928bd69ef
font_02_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 10160 bytes
SHA-256: eaaf59eaa90a8f5feee476ddcf6feb199e2f3bf271ef732ac3a54c3f684003f9