Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82da0844e6869d7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 14:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3251347119f788f7c2922c7b2bfe003 SHA-1: c9a23c28f3dea46f605b588f59ed0af8cb6e79e8 SHA-256: c82da0844e6869d74f03a0e594595c1e4c8f8c3c5afa2c12f4ddf0738dfaaa81
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=como+gravar+a+tela+do+android PDF link annotation
    • http://www.elstar.ru/uploads/files/79896876001.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c121f42f---70614440812.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/puzenonedapuwixomu.pdfPDF link annotation
    • http://tw-tms.com/uploadpic/xw/files/49558702267.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ac8469fa3---noxujebudupukitatukase.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3415cc389---pexalog.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/noteropam.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/kakunimej.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/58159064785.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/gbpsu5vpqesjepdj5dhjtf93k5/jobonewulaxegase.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/49644473241.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/tetife.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6j0csm8mrvevhh8b464f9n1c55/33848781397.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/58085028540.pdfIn PDF document text
    • http://ccsl.asia/files/76849884759.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/48040898967.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/3910594201.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/58016701303.pdfIn PDF document text
    • https://eniedu.com/data/file/20210904101117.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/fuzogu.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/vudurotuganitot.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/91036231584.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109071448005440.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8c4debcb---552747210.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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 20048 bytes
SHA-256: 13031ad52b73f170a5832788d96d4ca98fb866a73b42782fd22ded47c4f4e9c9
font_02_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 10520 bytes
SHA-256: 90d425f6334fd9eac214fb52b1994d0cfcb6ff170de242215e49df2e878a261a

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