Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb36bfd96a21951…

MALICIOUS

PDF

100.7 KB Created: 2021-09-07 12:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e903debd7b39f4919f7ae53a060aa5e SHA-1: ebfb3281191efa42cccecf43e77c8ab52d26650b SHA-256: 4cb36bfd96a219514b8f4dc8ea29fbb249381c9a6be907eaf6188aa2aaf033df
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://bhandarisurgical.com/ckfinder/userfiles/files/maxarasus.pdf In PDF document text
    • http://farmaciafici.com/userfiles/files/6335321688.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608069a6db900---xofudaxelopafatelogejed.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/50393819929.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/64faa5139c395165ee2cf1a688de1e4a/90869091635.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nogopogabawowusaputegakox.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1lmjjv4ss2ejsbtls6bichr3fc/61909155386.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/berefusejabute.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15930796417.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/forisi.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/ridutizez.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/90b5cdf885616feed97918435760e478/16292250452.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dcf7ba17ba---lugagez.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce3aab6e6---10548794451.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706827ee185---72858418609.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/7562492749.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/leligumi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081212c2ec63---30516160337.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210527140306.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa18da9c13---bepofeziradujik.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/86g2v071ckod6jgq59tirg84vp/rizituduzumavewewatolu.pdfIn PDF document text
    • https://parc-hotel.info/file/44225384872.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3fade064---87497109407.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ac1d8b6356cdde6c16817e46c0549dd9/doxodikusaxumatawudef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=swami+vivekananda+books+pdf+tamilPDF 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_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 11016 bytes
SHA-256: ec230891d71070ec16ef3c8abb6dd0c365037f2cdafe12e8a0a3cffd8f7afe8b
font_01_sfnt_off000131e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E1 22384 bytes
SHA-256: 5b911d8a4e67e49c1f86c8758d50e72728f3f31c871f1d34e43974b419b27e29
font_02_sfnt_off00016c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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