Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc4ae96303e9c7b…

MALICIOUS

PDF

98.4 KB Created: 2021-08-26 21:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7800c027ad09121223d423f6c767af0 SHA-1: 9122603d6218a7874a436ed25052a0bce4140d4d SHA-256: 4bc4ae96303e9c7b7e7d70a64a19d25166e17e0b82253caf878f641e7dfb14f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection score strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=fallacy+of+exclusion PDF link annotation
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b053586fe1e---tanepifizukariw.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b86f25ad866---bujubemo.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/fosekibuxategitu.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/wigawozapirepinadovoduk.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4551ab6d2e---7321909545.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kagedivedakano.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/74512314095.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/fikuvutamegidiwomi.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xajuwubu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bfuonjaq38jq9j2h9vlgl9ftet/10778545434.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e65d72d8bf9b73cd1ca59f6ad80be45c/11934252253.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210620151438.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/24285135755.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0294064d2---86338484113.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1c9e7bb2---98844146079.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fbbe24c41cd5f1035db05b963e654a21/57981578939.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/19607845063.pdfIn PDF document text
    • http://stl-hk.net/userfiles/73434315491.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e847b498e---67306366955.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/jumilokumume.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/j681ggbnegn5q9qo5907f4upjm/kekarakutivuxu.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/63352923647.pdfIn PDF document text
    • http://www.polni.si/Images/files/giral.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8c64f2d72---8738240332.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_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A05 16380 bytes
SHA-256: 90e2b61f43d966869b25f6a9998a160a38fd273b4b41817c9a6e6b424b5d28b0
font_02_sfnt_off00016443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16443 10424 bytes
SHA-256: d01efac6c7398744246034f4907032cb02f0b585c5f7f1260e8697dd1ddf9c30

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