Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8a64e025a3c928…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 18:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f047f85174a9a2589a1c21c96ecf8e8 SHA-1: 26925b53dff288b2c0ec24a49f6c6e1a060d39e2 SHA-256: ac8a64e025a3c928840a7ca3a2dea4981903c5f4905d1be199c8d0d5feba7324
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to external PDF files, many hosted on domains associated with compromised CMS uploads or identified as disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly indicate a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://asbufestival.com/uploads/FCK_files/file/lakitepoxamadakoregu.pdf In PDF document text
    • https://vleek.com/uploads/files/temugaba.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621690213.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/dosewezufari.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/070qvkh8fduq91t0plni2etot0/kuzezemujosapuxeluf.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/33110381685.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/fulonabosarijukuwoba.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16101065da2b2a---midivuvuguvasopazubaloluv.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/65245353535.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fef27906f3f2d7f37ec304be95fbf7b8/lilunifunadagadesajawub.pdfIn PDF document text
    • https://icbacademy.com/upload/files/27397400231.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210603041023_659189068.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8832e0cb19bb28eb8a89ed9c37ca2381/ruxanazitibezoda.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210528144815_721580102.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/81294224782.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dukufuninoso.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b6218256a2590fa4784c0506a316d7e5/gebanogamemexu.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/xiburinimogezizofexozum.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8559c35bb---13861170250.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/semagulozeveramomipoveki.pdfIn PDF document text
    • https://www.verimevzabavu.sk/ckfinder/userfiles/files/9016319764.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/35803028682.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vamudegum.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106240945568216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=use+whereabouts+in+a+sentencePDF 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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 20824 bytes
SHA-256: a93359dedd622359292b5330f29fc5d61079575c6353b980be7883a0b42c2ebb
font_01_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 10616 bytes
SHA-256: d1394f2d5d123088883767f86489ddd5e9bea25e1a5c8371edb0938f9b27732f

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