Malicious PDF — malware analysis report

Static analysis result for SHA-256 5906efa84ab8d2b8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 06:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5af7ba4cadb948b824d716311bdcd3d0 SHA-1: 4ffeb0c677ebdafc9169fb8ef8774a8dc7a1fc90 SHA-256: 5906efa84ab8d2b83917fc6bc8c75490f72185bd2208a2f2d2d49dd71d24730e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting it's designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external links and the nature of the hosting point towards a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=azo+dye+synthesis+lab+report PDF link annotation
    • https://giverny-bkk.com/upload/files/76815613384.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/87289436981.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/jijapi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819f566a5d4---jiwosakawetomokumol.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/zabusosuzudaxokigud.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/35e8ddf0bb43a4e75b852819f069f2aa/fivabolepewasijujuwomapef.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/96903786571.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/jalifikejolulafo.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24efc681f---96029053398.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mrvs8djamc7dbajk4gco7h1hv7/lujuwigi.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/78198192786.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/devaxopajababu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16101033f221fc---zediloritigijomuwujitaxu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c439648c86af1c5b93820f059d1f8f34/koxilaxu.pdfIn PDF document text
    • http://kotolantopeni.cz/file/tafevokalofosapoduzopiju.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/faxivad.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///84122952360.pdfIn PDF document text
    • https://doitoutdoorz.com/file/7HBe1q2KIsAtZCWj.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa783f6f0cb---47655678493.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc84397f29---3027236843.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/gudukizazeluxu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/60375399304.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/tuvofigax.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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 16948 bytes
SHA-256: 3e61aaccb5ea87993291bdce22f5dcdc86f82920957a92ece465a932a7871a50
font_02_sfnt_off00012d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D07 10784 bytes
SHA-256: a3c7471f5d1f1f084c01dfe98cd3f1286557cdcce7d02d1fcde9e422fde278e1

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