Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b02f1f7f720cc7…

MALICIOUS

PDF

102.8 KB Created: 2021-09-05 22:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8f237c30c220f28a1b48aeabb7ea0dd SHA-1: e5e4c3336b8ac8285433a54b88e944904a0bb67a SHA-256: 02b02f1f7f720cc77b2aa0530172520e599c46d4e2c7a6a7b1bba983be6cd7c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf66e6c8c---12630785916.pdf
    • http://zdravi-kromeriz.cz/files/file/43230389357.pdf
    • https://torbay.ru/images/uploads/file/54854077491.pdf
    • https://angelsstaff.com/uploads/file/zipubel.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081679fa6c5d---pobonisotogujofebu.pdf
    • https://balajitutorial.com/admin/userfiles/file/vorezedifazisewabaral.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jalodip.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iuit83qkchs3qi8h9c88049mp7/muxigubew.pdf
    • http://digireg.com/upload/19498121796.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-23/20210523211347888275.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608739114b6bc---1375720746.pdf
    • http://mixline.ru/img/lib/file/seserovowubate.pdf
    • http://mgbig.com/upload_fck/file/2021-8-25/20210825020005649953.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/t873buedk8sjeb6he94c83uldl/56222665342.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad4273d92---13402968592.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd569c258---zapajapifisupexeraxosul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pixiv+pdf+%E3%81%A8%E3%81%AF
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd7.bin
9a62995d1760fc71bb864c53ded23756823c2df1b22bdeb6c107692d8ab3fc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 5248 bytes
font_01_sfnt_off00010120.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 16792 bytes
font_02_sfnt_off00011931.bin
10468e2243ac70f27e1399ec1d70a5787c5d4bf4ef0a685288cb80c094beb585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 16376 bytes
font_03_sfnt_off00012fb2.bin
bdac3a0d0ba6ea3a4911aa64503b0a5bc9eb2e0bdac1a360ededa56e42b407c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 9728 bytes
font_04_sfnt_off000144f9.bin
590265ce45a186d67a6a08912c84974533613e13c6e3fe1feab72e757071d9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144F9 28580 bytes

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