Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cc77d16b489f9f…

MALICIOUS

PDF

93.1 KB Created: 2021-06-27 05:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1c898004919e629d4390458973b71b16 SHA-1: 848c53a904dba187c7d48dd3816976aa5e2e9967 SHA-256: b2cc77d16b489f9f2d1e864ab6021e0048cc7eaeabce8ea0b3f49ddb92b95fe8
164 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=step+by+step+math+problem+solver PDF link annotation
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mi5hrmvl3a8s4a2lqq36otclof/nefikufudamixetuvanojimut.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/oqnkgu3l61pm2g29554op49ap9/vugabivemosapazijug.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/ff80ebb0b5b648f8c1cb437aaad54fab/nimutufarusew.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/90rqmnjcrgd2lr3ef7e62dckrk/85647070014.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3958273ebe---20343558753.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cae2f407598---tapisajuwu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59f0a7ddcc---72815102977.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060900311049.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ng97jvkigjqsmvt1ijf3278a93/bozusulepafil.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f315027a70---50992889935.pdfIn PDF document text
    • https://tipresentoio.it/images/file/wilubosujirejot.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/30040056512.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d634d0e3bdd---dajagatifuf.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/fa3fa9637f8a5337b2ad34ee36a77dfd/83447307647.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3up5ke92gqcnfnjd3t28k89u83/21343081151.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829ce1add03---34839636164.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084ab39d3aeb---64778313876.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/mexajavegekapazoboxaboru.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0839b2981f---bewes.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/mudovo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/xunukasawijesatu.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nafepagibilatirogo.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/38173333900.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c73d23a323---94171735359.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 17784 bytes
SHA-256: 48ee59b2e9a611a372c1ab4700cf7f85a877711c5dd4448c127f57757937c3bc
font_01_sfnt_off00012049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12049 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD6 10716 bytes
SHA-256: ba04c7e61c3550673285a14b3ec3a3c18ffdfb23ebdaef5b732178758d6e417c

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