Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc9e04c51771adf…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 10:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b1593c91b3568f5125777fc12d36481 SHA-1: c277149d82d795fd1dc6ff286605f3ece94df7e5 SHA-256: cfc9e04c51771adff43ced3f31edf65d7cf97be6a08c70b0fe376493e62a7ed2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external sites hosted on compromised or disposable infrastructure, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URL analysis point to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://nicenpos.com/userData/board/file/880167286.pdf In PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/zomifu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f4245664207b268c2cc1f7488c4dd242/liviwarereso.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/tojovizusi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/58a3e0a80df830ada00a47884d04a7f5/74915150339.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/rijalakixujevukinubukekig.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c113548ce8---81700422575.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/naxuxikogidizivo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/vewum.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160fe3ad5b35e2---38093600853.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/86716807773.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/966dd3f4861419276be8f9067eed80e1/37201123864.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210607061415_yfe56m.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/zowiroj.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e5e418a5---kukuzibapifozan.pdfIn PDF document text
    • http://519pf.com/userfiles/files/61735525744.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d8e3a04af70fddea398defe7128d7e5/75233827555.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/44572551498.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea54b3688c---46712008774.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9d893bcb---bijasilubojojupur.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/jonejir.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/93699015805.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608308fa2cbd2---guwexizibukajidowit.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370d567f1a---18039673881.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/xubaloduxubikebelutufat.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/de7fbb22eaa957dac5789b1ce408b1e7/kuxukupetimevabu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b3f3685e---guberezaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=affairs+cloud+pocket+pdf+april+2019PDF 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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 11144 bytes
SHA-256: 1da2d39e047cb5cac8497eeb765e8c32b024e361fd3c92034a987c7706012a1d
font_01_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 18004 bytes
SHA-256: 92499a93a9818166c5d0d71a554e1ab794828e59edbbead344f5a74a146ca292
font_02_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1