Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02da2e0f0f8f42e…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 07:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 241bdf04de8302902375062fc58ce372 SHA-1: 5508d921ade7956a40dd961770f8d31755499cf6 SHA-256: b02da2e0f0f8f42e281ecdbf4b6db3fecd0130396f60172ce88f2a3c612dafe3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cdmatik.com/uploads/file/banukurugikixigo.pdf In PDF document text
    • http://polipadel.com/userfiles/file/fakavizow.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/954830bb49478504ab55ab1c44e49d53/76478155465.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e5b29d47---lutijetenevijunamanum.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c342187f8---89215432183.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae6c1c8f5c---37326331102.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f06a5d06f32c39d788afd27fb0bc6d42/vazuwibi.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/dukojidigin.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607121592841e---julomidafunoxutiz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/51667f389da522434d1ef2bdfc5ca3bf/985532739.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5165iu2f2mvh331aoubnn07qj1/vezedut.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160966356edd53---wakodopuwegogipaluna.pdfIn PDF document text
    • http://iltorg.ru/upload/file/79416290999.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761e9f01123---67377657491.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2f09551c---25198145494.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/zozimegi.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pichur2k0n2tkmcmkvah18ubjr/65624665098.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/64802590919.pdfIn PDF document text
    • http://artside.org/data/temp/file/sobonuxumesuwekit.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/3i46ns40q9u516uip65gt10io4/lelujisufunogawupalufunu.pdfIn PDF document text
    • http://mamam.by/upload/File/file/bawagudunetofunuxa.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d192750adde8d12f3cec301858fdd11c/79761337997.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8a7a14cacc34324cc32fadf6cb59fbb4/refusezapimadix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=540i+manual+for+salePDF 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_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 17540 bytes
SHA-256: f4fff6c1cfa3326de2b2cd9d581a70cd21ff7669d85528ba299a36ba305506a9
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 10616 bytes
SHA-256: 95add52ffee3e2b02f0cc49c1f8d114b9ef42ec738ca731334060dbe5ecf1363
font_02_sfnt_off0001388b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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