Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a60d8f7b2921f7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 10:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa5dd84942c22a0a7efd7179da493e9c SHA-1: 5eb1b2a99613f3bbd95ff51ef2d56808a0eea106 SHA-256: 74a60d8f7b2921f7247adbca3a15955f0434f70c03fe2c0993259492b0e8d71a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly flagged it as malicious. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/99473761190.pdf
    • http://ibrahimalsada.com/pics/file/mudejulijomisad.pdf
    • http://belean.pl/userfiles/file/pelipifowepinakogowow.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4f11df31952b5310723ecbf420e3ebc5/dubapuwam.pdf
    • http://habitat3.eu/userfiles/files/dukezobuz.pdf
    • http://aktifithalat.com/resimlerfiles/12445745020.pdf
    • http://ttfi.org/app/webroot/userfiles/file/90689094956.pdf
    • https://alebusph.centralcms.cloud/galeria/files/jabovalorafaveber.pdf
    • http://wwsm-us.com/files/file/59214552786.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143a9898bbc1---48282065137.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/473736d39a326ac8a3e51e0ac68d2c28/mulekagowo.pdf
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/nesejemep.pdf
    • http://www.sas.edu.mn/ckfinder/userfiles/files/77126341241.pdf
    • http://sswjeans.com/files/43824363002.pdf
    • http://ekopaczka.pl/imgbrama/files/77027686967.pdf
    • http://aytekinpolatel.com/image/files/48022206549.pdf
    • http://rund.cz/UserFiles/File/bakusukifewakivip.pdf
    • https://stealthwindow.tw/uploads/files/202109131731417206.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ec8dd3674fd471e8b294a4ad3c95eb2a/fitejepuzuwibo.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614552a1249ef---27257149627.pdf
    • http://pc580.cn/upload_fck/file/2021-9-8/20210908120217700253.pdf
    • http://getdol.com/page_data/file/susokepujo.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/73b161336bb97273f92eec6bd547ce8d/50616633279.pdf
    • https://reparation-mobile.net/userfiles/file/91037654369.pdf
    • https://aartipalette.com/userfiles/file/10474646440.pdf
    • http://chayka-svg.ru/files/suxobugerufoduwiba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=super+warrior+dragon+legend
    • 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_off0000c096.bin
03a4702e24cca70e8916bfda1a86152fa20d84376939aa149bc908d950458fb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC096 10560 bytes
font_01_sfnt_off0000d88c.bin
2ddcf5bef705379716afef882a05036756b2adb7d16bedd0317124e848ef4573
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 15996 bytes
font_02_sfnt_off00010193.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 16792 bytes