Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d848e7594ef4d5…

MALICIOUS

PDF

81.3 KB Created: 2021-07-04 20:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5cf7a4b36f5e1460d8077636dbf4607 SHA-1: cf8533cb88c7cda498d6305f01824a65d8b62578 SHA-256: 89d848e7594ef4d5b7c73b82af88493554f2fb3ada835d57b24a5c36327069b2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://decaldankinh.net/upload/files/jebexoladeda.pdf
    • http://lev-steklo.ru/userfiles/file/66289417125.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ab0a80d25162ab4f13d8be46f1d2b365/wosewixibake.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/841c81706d990cb1ec1da9827be85e96/83715204627.pdf
    • http://tourister.kr/userfiles/file/41248360451.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dbd2567bb422a4037d0b00d84b4b1db4/zobanasebi.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38f9c1687---fizewel.pdf
    • http://fixafilm.se/userfiles/file/xapasigamadutufovar.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7ae786fe---vabewibigaliwe.pdf
    • http://greenplanetnepal.com/userfiles/file/49635467192.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5ae05891---24089108451.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa438b9e6a---48330353818.pdf
    • http://accessprecision.com/userfiles/file/vamonudafegutigulapuje.pdf
    • https://topclassgreenery.nl/images/file/lerixifibawigiretot.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1b1680d6f---74244021621.pdf
    • http://accessprecision.com/userfiles/file/67119675.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/74aa2fb5ba83aa8f57d3ba7ea8b100d0/nonug.pdf
    • http://www.tekkoo.net/images/library/File/81737934325.pdf
    • http://jingluo.net/uploadfiles/files/wesisavijodexut.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e338a14c---65064396085.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/58618710712.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/4829744195.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2e248ee060d62e9f58eaec56cf0fe788/17653424903.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=houses+for+sale+in+perkasie+pa
    • 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_off0000dc0a.bin
626ac737baf8f157de6c106fb3759ed655753347c1b05429d4cadefcd9dcc2cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 10436 bytes
font_01_sfnt_off0000f3c2.bin
908e2e548f2a9c6df7902cf44e338b6b989b895cf3b61b7311c5fcfa6039b95c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 16988 bytes
font_02_sfnt_off00011ff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 16792 bytes