Malicious PDF — malware analysis report

Static analysis result for SHA-256 34638ae4cc9337f2…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 18:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ab7ef8bd85de2bc0c58b79a6ee3e086 SHA-1: c5c07b708aa70d98f8616a5be984896ced7ec4f7 SHA-256: 34638ae4cc9337f21eafd3387006c0cfec6cf6294d55af64b2506370b9a46f89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic firings suggest this PDF is part of a link farm hosted on compromised CMS uploads, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 https://crewmak.ru/uplcv?utm_term=philips+air+fryer+manual+hd9621 PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307752e596b---89602984339.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/vusovenuv.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/12995364329.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/75431986849.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/rumiv.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161380d1d63ede---54462469860.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodemerolixovumotuzib.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/37314944779.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/ginipoxekuve.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/gomipixukunenipajozanejot.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/roxewuzenamemupubiwu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135fa24015df---lufawumalom.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/vetoreroluliwizajaget.pdfIn PDF document text
    • http://inica.org/files/file///86054392581.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/gosekexevojijafolumes.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/venatijix.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/zapedomisidutalemuxu.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/sekaku.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/sugibejaladeserabega.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8d4dadab---7038400513.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/eb923359f5efbcb32fb36902ba207b4d/jivovab.pdfIn PDF document text
    • http://vhshf.de/File/geligesugevafidopafupi.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/jofovufopuxarozuvotesena.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/65711010774.pdfIn PDF document text
    • 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_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 18024 bytes
SHA-256: cef84fb49c672e9b6e22b8eb9f33d19a6f61f18f562ed230ff1c088c4d6db0fa
font_01_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 11268 bytes
SHA-256: 78c3026b9290b9a40b5fce060e51ac24c0f795700ba16484b01541d5bd717471
font_02_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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