Malicious PDF — malware analysis report

Static analysis result for SHA-256 9577c41bf0b4efb6…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 09:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a4b02c49f24e8fd8683aebccda0fc55 SHA-1: 89c3182108dcabb10b11f86d4627cb9760b3302e SHA-256: 9577c41bf0b4efb6fbca552a74cc9ea58635f5b5b2a2d08187afc57ee90c9093
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern appears to be directing users to potentially malicious external sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://quiltingacademy.net/fckeditor/userfiles/file/sagigup.pdf In PDF document text
    • http://stisk.com/file/20000248475.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/pifaledewafanipimivevero.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/tolovapeban.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/fodurelowilepokubabozadum.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/85667270462.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326b9807e61---28775864925.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/kurajopage.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/16605740937.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/85344320527.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/loteje.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4abd234b---rapisokewakekaduzem.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/87721983869.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139da0e2d385---81345621135.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61ef679d6---lijupaxev.pdfIn PDF document text
    • http://belv.ru/userfiles/file/latiju.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/b2lrjgg1ine6lbpg659b1vl5t9/65747199125.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139508f46c---89680073201.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/54920674153.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/zilekipetufevisamamaduf.pdfIn PDF document text
    • http://jiab.net/userData/board/file/gejajinikovabudofelozamis.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/22027612317.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/sukegijowewafosofipobis.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/sowulemif.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/bolejejizetobod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+2021+mobile+apk+downloadPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/98145434786.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_off0000b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 10880 bytes
SHA-256: d6073da53871acfe378152df665fd58afaf480ffee60bb898dfb0d4cca14bd07
font_02_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 19672 bytes
SHA-256: 9ec38d6d6506c5f6c137f2dba35fdc74dd5435b14e36798155622afca4b48578