Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2464ba3f1df2047…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 02:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 65bb8b48def5c018603368690c26663c SHA-1: adb0414c76df552e82f0d85d1200a53a3d2dda77 SHA-256: b2464ba3f1df2047efb447f4da77af360fd7062b3f71d4a8b8155db5afefce79
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 0.9986

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://orvosvalaszto.hu/uploads/files/tetum.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2120ee3114---lawamonuposovalak.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/moliposuxikususet.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e7032278ff0bb57f0dbdfbf1b4d218eb/zukosusuba.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb85949bf---37198322211.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/80035014578.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7ce332023f986f7433b61a9d4dfc2591/denirujufuvut.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/65784257564.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798780db090---49231459552.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/73525484216.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/51435694287.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/pomevufonugumarorumunutex.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7db27a714.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/17980901575.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c68886f1e5b2f2a004df64c905afda2b/9687026566.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rovedowi.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/50949458442.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b3v4uq758hhs1tr58ut8es3cio/73431356412.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094858e5570d---vofibimidimo.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/50248959396.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/75152308800.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/11640524365.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/8141ab5f7682dd55321b9d35ac8041b1/68568183704.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/98e3d5cb6598dda1d48857685489ff5b/3544156243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kodak+esp+3250+software+macPDF 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_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 17528 bytes
SHA-256: 456735bb4ca23272bec9de3fec83599103c6d4a3a558b7757b9855814b0748d1
font_01_sfnt_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 11256 bytes
SHA-256: 78ec96747dfb488bcc80fd69e9043055eab2800332a84cd1ef76ca26273d334a
font_02_sfnt_off00013c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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