Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5cee92837af96f…

MALICIOUS

PDF

90.1 KB Created: 2021-08-02 23:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef5693f65fec6a3f51a404a1e2cc2e7c SHA-1: 4e6f4df9e31a3a5228393f394f386f475f8f19eb SHA-256: bf5cee92837af96f5a3a70db7424d8dc14031ec667df9318d760a08567674669
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://allytemp.ru/uplcv?utm_term=doraemon+stand+by+me+2+full+movie+in+english+free+download PDF link annotation
    • https://menu2uplus.com/images/file/furejubevisusemu.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/77737413675.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7190ba9bf---89689585554.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608500303a5f7---fakaxexap.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/zerovobokesuk.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/96110039830.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/valozozidogujedegodafu.pdfIn PDF document text
    • http://rc-modeller.se/images/file///jorunivof.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b0e597581---jaxawile.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/18992301653.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/wufipifedi.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/51243700174.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a481bda1562---9584452409.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mos7noa73vdtl1vcerem756mq1/41657255588.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7bba024df49b4fc7fd3b29d74881e03a/vejalozafepozelurewizub.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/20566497131.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/69012949381.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/nabajufigovemi.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/xudabemibiroteloforavuk.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e32c660c97---fimumatadulebigobosudix.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/71aab1644812935ebe8d93cd9c371bae/robisudolosixixefixuf.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/390383d3c7146aac335397d8af75da08/jolinazimuvujipipesudije.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c3546d6254e---3226642671.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/xosusoga.pdfIn PDF document text
    • https://sbufficio.it/file/40469477462.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/58277938660.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_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 16920 bytes
SHA-256: e38081e4a5a2d3524813d9ee211ee83d2bbcd021cc70b0367a7ad4e52d1efdbb
font_02_sfnt_off00013ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBB 11428 bytes
SHA-256: 2ba0ce866c1be529de6855980d6fb18b2ff9943902c9fd56327aa2d9d6bf4281