Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d27b5cecf838e49…

MALICIOUS

PDF

100.0 KB Created: 2021-06-27 03:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0a30912287e415a1b2ba0d4c148fd9e5 SHA-1: e3e21e96a52476ba47be9a7d7cff89e70c55cd37 SHA-256: 4d27b5cecf838e49f10e7d2c010a3128f165048e27df21001b16c3190fc4c00a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the high ML score indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609480ba9df4a---88401518946.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e0e598f5---xapuzavutaruxisugor.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16080b28159aba---sulomonaralo.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/h50eelr0b0s6hnt5u0vskbf1ri/95745416273.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/84900620551.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa131b5ea7b---nodafidozamimevojan.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796dc09a291---safadotazefipixulumiv.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kosowodovop.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/c2lq7ml27bfr9urhdqdmvm3m3i/vemike.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d31764fc01003aa372503b9325d51bed/3404769940.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcf8cbead---tafixosoz.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/53384172093.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f8ddd0ad---34041791686.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9dc27266de98ce470d44a30f00483d97/38519122109.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/24761391053.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/5400726989.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae46a432238---fuxezodof.pdfIn PDF document text
    • http://simonide.org/userfiles/file/4159883489.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/bnmgfhmacegpek4u6m9lehvi15/57649323961.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/gujadetumaluxawogavisomu.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622373684.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb69f18a4f8---99614979881.pdfIn PDF document text
    • https://defaico.com/d/files/88630515286.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/pefajevifubebuxegiwixovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wendy%27s+chili+nutrition+factsPDF 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_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8C 17616 bytes
SHA-256: f54cea37173303b70f7e7547340b486b1d4915fbeefe390ff698650101c3b376
font_02_sfnt_off000169b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B9 10812 bytes
SHA-256: 494dc9129a537b727dca8ca7e4663a0c31a87007bfb74af402a2d799caabb7ea

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