Malicious PDF — malware analysis report

Static analysis result for SHA-256 3824ab366ee8b83d…

MALICIOUS

PDF

78.8 KB Created: 2021-08-10 16:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1fb390d3b159640b46eae2ccd1e7c37c SHA-1: 9be77896a0404a0cdf2b15369998e90eb42ab9b0 SHA-256: 3824ab366ee8b83d2a00883b655456cc5423c7a04304e629a1b8fd9ad7b7c24b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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 http://bike-aholic.com/UserFiles/file/nibozaneved.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/jexid.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/c8e1a1sm1fv23ue579e8cku834/fidasolomobebazudizaposa.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/11710122797.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/maguvuligipelezirotam.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/33447552895.pdfIn PDF document text
    • http://ciskmv.com/css/file/89200431784.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/b730p2485blbmaa18agv5e4k5q/49247639228.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/fit5q4ibmecdnm19d95k92dsjk/4943405206.pdfIn PDF document text
    • https://schmitz.cz/res/file/daxefibikuferile.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210804_006C35F9D4C17CFF.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/17755178208.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dacjlvs42k8pkebh2kle3qdi45/54378261177.pdfIn PDF document text
    • https://susta.vn/userfiles/file/50887153306.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zulirolapikametipa.pdfIn PDF document text
    • http://itfind.ru/uploads/file/30254001093.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/vv8o34i1uc3e6h030a0ddrljh1/perevej.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/52760051704.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e89a1bca3---motelumorejunijod.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/98645565452.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d37e462aafa145f41331663d84a18af7/56458919969.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98fb05acad---66538742495.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/zafumabo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2724e674---petisesisosekosi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fa15c964f748ebd71039495e728d43cc/remidamefujekadezawif.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0acabfe6555347e6e159288fa4e54e9c/65106693232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+game+ppsspp+dragon+ball+shin+budokai+6+csoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 11452 bytes
SHA-256: edd7b13e59be239387d63281ed9668fc48ce65fdf934cf994b53317cbf6b614f
font_02_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 16496 bytes
SHA-256: 24a3ac5a3e3feb19eaf06b6475b517be7831a580a4c5a4c4ba8e978d2b6fa353