Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e06b967e9bc8dd…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 03:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 058f3682bdf0c078a92945c440d9f15d SHA-1: a21e810aad355a07b566cf1d98cb1a053bd00eed SHA-256: c9e06b967e9bc8ddc421df35e10f4a5830bb28cc44a49346df6783ed0f72bb2f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristic analysis revealed numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection by security tools strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=the+gone+game+online PDF link annotation
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f142a94966---gowulexosaroribetupes.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/481sd6r5johser7m29lsrfdg4t/62882652010.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83e9c2bf1e---6421776089.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/36493032191.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4a4cd82d6---negumib.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079307a462fd---83576768428.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/18854840955.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/94440359909.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/juxutegarojozapagopafeg.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/61356507607.pdfIn PDF document text
    • https://atl-50.com/files/file/zasapoburemikaxomiweg.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/65163348024.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c19ab50c39---10822202194.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/kikerobebixixagodopa.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sd5n70hi0isnadgs7npikv0su3/82322371227.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3543f8cb6d066a284c39ff0a881b7688/22971261099.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/dokupoliralixesiditaputa.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1e88cl4uqq7lj2dk1j78huod18/pemira.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/wovusigexaruzivibedino.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/44571161842.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/memodafetev.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/34728977812.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/feb6d1e496e1182c5654d6c711de6b6e/54104252168.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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10152 bytes
SHA-256: 7b2b9efa5eb5ca5d2c3f150548d432aaeccdd6f70f9238d9e53a4bf10a4a030f
font_02_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 17468 bytes
SHA-256: 3b70b711740e4c86f5a9b46dd87f7ee5fd855b7fee08357fd1d3b4d16fc53b35

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