Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf672b0844f88e5d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 19:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e39113d715e125e192b85cde5a56612 SHA-1: c743206fcd0e3212bc07e824f4d32ebaa985b651 SHA-256: bf672b0844f88e5dfbedb6d9e4030d262ef2b193ccb996cc7d045122b18b13ae
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised websites, likely intended to deceive users into visiting malicious domains. The presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133795dee833---7507729635.pdf In PDF document text
    • https://rowsontw.com/shopadmin/upload/files/3048013407.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/56916913843.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/taremosatuzerobar.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd4bb92c69---jusabewojexikiwebusatez.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb243a315a---tifumikufusevezunoz.pdfIn PDF document text
    • https://2acontractor.it/images/file/rokejew.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/1245570236.pdfIn PDF document text
    • http://hidropro.hu/upload/90047909675.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/38060759613.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/zigidigemo.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/luxixivis.pdfIn PDF document text
    • http://naso10.com/userData/board/file/48677151101.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/katarif.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/dorebasereded.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109030245327552.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140021494ab3---24282611083.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/80853479417.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/nopifugixebirofotezaj.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/5531666376.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ocs6h71uaa06gvvoblntbqh7p0/relepufiwasuvul.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210908080015.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/suzela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=4+multiplayer+games+androidPDF 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_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 16664 bytes
SHA-256: d11c881670ddd581a36d07a6ac6f4d2c15e2692289da30ed20a5a865d7fedf50
font_01_sfnt_off0001174f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 10932 bytes
SHA-256: 21895cbac381c84a44569edeef654707cfc35591c1034daeec0e440baf0e75a9
font_02_sfnt_off00013063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1