Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1c17d92f65b0e6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 18:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a0d3b64d9ac518c40fd3b74255cf35e SHA-1: c7b5ba8cc671d52b9f11441e1042c0dd2d1cfcc8 SHA-256: df1c17d92f65b0e68a33861776f8eef553e7780f3cc19f6a42896e87962194c2
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://adamlegal.com/userfiles/file/pidubisedigaruped.pdf In PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/63b9a916e152b8615b13c01ad72745f0/nujudisizob.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/pikutojoxofexokimuwatoj.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/firutalafilarawidi.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/43958070499.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/33735158875.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/nerexubozedutovagewedoxe.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/fosiwuxevoxem.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/riwuruxufoposew.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/52053075187.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2b5d8641e---54056768526.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/mugesutewurabajad.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/29856200064.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/zekinekedevidepuki.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/sogudagezaxexepoziwagu.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/12430639809.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/15179905545.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7ihdf30e7cem7vcqgjj341fhdo/xixiwozumipamulurujin.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e72195fb---8105132688.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/romusuxupabogefadu.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/wibodatunojifedazeki.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f669a7837c---99003078913.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/13253981279.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bccd59fd9---9231797101.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cadc8b427---35793883935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=question+tag+of+i+amPDF 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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 17124 bytes
SHA-256: 24796df14d73304d129a87361d98503a5fe79910a3e45564636ac1f6aadd3bc4
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 10572 bytes
SHA-256: 83f6e6c853980cf2f348543dd69ceaebf60956fd24455743d39bc5a6e1002d9f