Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cae4a654ac0630…

MALICIOUS

PDF

90.8 KB Created: 2021-06-29 15:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c433bb6ffd2c8c712f71384260d996b SHA-1: 1966d017a78e79a4a3f0cd462d362ac28fcd8a13 SHA-256: b1cae4a654ac06301eb9a8e469395f95de50a3c238e1d24124d46479e061c2da
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm for SEO manipulation or to host malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tradeweb.es/userfiles/file/nobigeme.pdf
    • http://zaun-produzent.de/userfiles/file/boritazixuvinosimiri.pdf
    • https://lawyerupsmart.com/tempimg/file/44157077246.pdf
    • http://klpa.net/userData/board/file/36943348798.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c440ad766bb---bilefi.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abc166091e9---69065448000.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/d37ffurma8v8dnk60vq174omip/55042364011.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da59a063504.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/46886470859.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b641e0a662---79627146624.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7c29360389ab2deadd5dd67f3c37d7a/82017589588.pdf
    • https://bczenekar.hu/files/file/napulasibarupovepo.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37b66ea891---rikezikojali.pdf
    • https://kitapkapla.com/upload/ckfinder/files/zabelunovexesojupudel.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079b17c382de---zokajobobezexitidakej.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/d1563f82e31e0ee756af64d3426ae9a4/11478127199.pdf
    • https://norservis.com/files/files/209834449.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607646a4bb0e8---10590824800.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/95b7481339660a2628dc196948f5042e/84234269500.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e28ac81f---dugajaborepulemuxu.pdf
    • http://caramelitos.sk/files/84277773227.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/12705813278.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/45p56qs8b5tkcuc8p75of5ce90/gavuwu.pdf
    • https://kham.vn/userfiles/file/butodewizobatej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+go+pro+in+boxing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 16792 bytes
font_01_sfnt_off0001171f.bin
5568e4f3e9e4e3cdc965e30ccd60d47da90bad04ad14727a98ff75a50127ef30
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 10492 bytes
font_02_sfnt_off00012e90.bin
1947ea33e62ce51306392ebe4bc0213d8440fe664ac738652a097781990a6432
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 17424 bytes