Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b3a2d407fb70e3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 09:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a129acf9a0f89bbb3868b2ad33ef1e03 SHA-1: 80e0e453c783d82fdcf1608246f090633d65f03c SHA-256: 09b3a2d407fb70e3efa7e9840b46f96346cfdceb7082403867fd3e91f0432daf
184 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the document, likely a phishing attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://eyetracking.pl/userfiles/file/likaritemomopabudelofizik.pdf
    • http://retrievers.su/ckfinder/userfiles/files/zizoxubodegut.pdf
    • https://lee-trading.tw/archive/upload/files/zulebivotivoda.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2dd56d28c19c76682389d5f81141946c/56831034467.pdf
    • http://sictombbi.fr/ckfinder/userfiles/files/sebedowulobawabeduborebiz.pdf
    • https://2b3la571ga-70p.com/contents/files/27227568566.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139775571c88---26584397788.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pnoapgjq6rgch78h78g4r19o86/vudetevoguped.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614178b4481c4---fujogag.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/729990891.pdf
    • https://tortugafilms.ca/adminfiles/file/76606001403.pdf
    • http://gu-bo.cn/uploads/files/xemekonuzidig.pdf
    • http://polaryachts.com/res/wysiwyg/file/48362474550.pdf
    • http://traviet36.com/upload/files/16532385536.pdf
    • http://beiwendq.com/userfiles/file/36438921429.pdf
    • http://sinice-rasy.cz/files/file/26425298584.pdf
    • https://wolfgang-photography.com/userfiles/files/9357086066.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/65535949358.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f51675a76d---betefopaponok.pdf
    • http://meuble-tunisie.com/userfiles/file/75543609509.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/62246044188.pdf
    • http://pzhjintai.com/upload/files/6986109312.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/93595584374.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e7b64e302522095268aa795130667589/tijizigikomifejuj.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33296ba2c---lusukole.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=aimbot+ps5+fortnite
    • 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_off0000df17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 16792 bytes
font_01_sfnt_off0000f72e.bin
467ea7e2603d99e6127d21ccdee3cb0e4e9d8aad4765a9df30852da9047389bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 10564 bytes
font_02_sfnt_off00010f19.bin
f1939739d0a2d6ad3976f5d7ea1b66fc846190e94ee239864e9bed527db5981f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 17996 bytes