Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6b513808133b85…

MALICIOUS

PDF

82.0 KB Created: 2021-08-15 18:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efef0db22305b7a254ff9d8c14cd0eff SHA-1: c48736ef7cac61d33f4cbac0c016a33c180d6033 SHA-256: 9e6b513808133b85c40be043ca80521f33a4cb313c1c226159f6f120e4f58c1e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/082f5393dcf1af38beca85ed0ff97bcc/31240504925.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5e638937983cb9555693a887d904b32d/mubipuduvusur.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dd7a721d0---sufejoremezev.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/16489532253.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4360d23f34---pozovefuboruz.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/nekutogosabixudup.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/vukatuparedikor.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vexegodelek.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mesgmar70s763ep3ioeship8t2/ruralewojanafewina.pdfIn PDF document text
    • http://davcpundri.com/css/file/puduti.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/menovosijejuraxupagave.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160966ca8c2186---85628176041.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8ee8d5799fa8511f19a2e689fa33750c/luzojoxufukibujamegojakuz.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/48cdcd11a2f626bc6c65c4196f551c0b/bimiwidejozapodazun.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081103d18d57---92312396622.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/wapeki.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/207861809060a95b088a5e6.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/76602898251.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/dudaz.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a004739f0b6---84384776603.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a5159f602---65190337722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=seigneur+nous+arrivons+des+quatre+coins+de+l%27horizon+partition+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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 11380 bytes
SHA-256: c4659349cfa0ffddc92e496d720d43e5b2e3fb522110df247e5b794d96a8a033
font_01_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 18272 bytes
SHA-256: b652e335638e3927087da01da79f0e6ff44145a31223a0fb58b59dfdab587440
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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