Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d3b7f26bb866a5…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 20:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d13ca0607b6d180ba1246bbbfaba2878 SHA-1: 00d8957ca4544b2023fcf6db87f5472900b07ac4 SHA-256: 20d3b7f26bb866a5fd43439b04b8888504b6ffa95e534cd039e54fb22a480249
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://manpukulivermore.com/uploads/files/47590392828.pdf In PDF document text
    • http://davidhammerstein.org/userfiles/file/73399882947.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/cccdsmok6elmgi119t3tc80p4h/xalabazijozidadigejuditu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98fdd6295---98753400896.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/80383734324.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/65237331432.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8c2657d6012bd37e3a91e085aaa9335d/81603563604.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/57709557814.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/91148438729.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/rokofiba.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3ea4ddf4---76736451374.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hlv65q91k31q0jmaj1svnccp2h/91428949843.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cbe439d28efbae0328d932a1b6921a21/7904054425.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/mevulokizugisuf.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/dozaripajonepuwof.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1985e56f0bc7276f2e059abb13457a85/mebowak.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/73601436518.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-27/20210627095931588642.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/21689842925.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0f3a011c---niwopabifuwaguf.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/13673330029.pdfIn PDF document text
    • http://abwrva.com/uploads/files/jesipatebikogikadifowutu.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/xinizasanobogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=responsive+website+design+tutorial+pdf+free+downloadPDF 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_off0000d465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 11112 bytes
SHA-256: 8da3792ad8571c243d65f24ed2cdf17d27023a224395245ccad55d603f929011
font_02_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 17688 bytes
SHA-256: 93ceda0e96dc2fc9104b154bdb509a076536afd1822d4b8ffa029a711717052c

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