Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bf1d55ee1b717b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 02:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33ef755d68197ad4498be8410d74d593 SHA-1: 0b636a51791695ff0d417e003b892104af6a66d5 SHA-256: 63bf1d55ee1b717bba632ccbf2da24dd1176909755d7f31550427a3278aa8c3a
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting it is used to host or distribute further malicious content. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c633850b79---zajemusazabumebosezululo.pdf In PDF document text
    • http://veraschwemmle.de/fckdata/file/mupijifapejefiroluwovile.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7c365b219777acba6f8bd220602c0878/33177214672.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/puzezidedilonasazu.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/81332124563.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b617aea953b---34728505340.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/63528868914.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/82691417518.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65ba0f7cc---kizekefep.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/22566984453.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/31038772793.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c462208b069---32498675249.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/lukevaguzugunivetaxe.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9lt1imss7288j50qh302fna019/64603880482.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/14301325907.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/figadipijotepazukot.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/58524621221.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/19913618141.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cef23a7bb---42217051741.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/wivovowokutasabisa.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/rumefawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=photos+to+pdf+converterPDF 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_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 10484 bytes
SHA-256: d5358ce6fce065cd11662f608ac49c2ef94323f0023db84fb36c4095625ed1f9
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 17412 bytes
SHA-256: 2aadc6a56bc679677e2e6e919304e109a0b1dc01b234befb301d9604e7e2b613
font_02_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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