Malicious PDF — malware analysis report

Static analysis result for SHA-256 938f19cadbb9cdc5…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 21:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a76d899640f736abcb145b316581c529 SHA-1: a790b9a24da94819f2b087ea4466a114d210b6bd SHA-256: 938f19cadbb9cdc51f2ebfeb90cef22682d4911c49de9fcb6e43640a985adf1f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://patrickstaxi.fr/userfiles/file/xiwatovex.pdf In PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/30331889643.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/12822708307.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/gosizupaxorikilupexovira.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/84721169899.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a0f672882f3271b44025933e3e737c97/fizejejoxejukebavawex.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/wufuselegozisidexokuwa.pdfIn PDF document text
    • https://totounited.com/contents/files/loxok.pdfIn PDF document text
    • https://gulamanis.com/contents/files/xejuvidorutudawexo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a93e7c89f---60140753181.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/selokawow.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/xotabenodezuno.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/wakonavaloba.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bobilibimusabowotipod.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/xifadosaxel.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/9302762846141c2d6a2e29.pdfIn PDF document text
    • http://delve-cr.com/uploads/35491245452.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136a639c340d---44854834834.pdfIn PDF document text
    • https://grup-rul.ro/printuri-fi/files/10255855977.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/xafubifamugusowe.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/155b679a3d651072250a92bb42eb6b4d/14466403835.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021092611141473499.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/33973315495.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/6660065232.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/13721756566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jersey+telugu+movie+torrent+downloadPDF 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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 15140 bytes
SHA-256: b750f6f0c5fd5f9eabd175c2ab675a057db46e7b124a26e4c2568302ae76cf88
font_01_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 10948 bytes
SHA-256: 6e821af4749b137e6b8fe7482709310f73e815f403b0f6acd0440181671a156a
font_02_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1