Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acd774b35199afa…

MALICIOUS

PDF

79.0 KB Created: 2021-10-04 19:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a741a20498db0d028b516106814b2478 SHA-1: 802712cd84aed2cd33dc62a0bdb1f2368516a217 SHA-256: 4acd774b35199afa734bce8395b9e20a24dd9a59995f64b1e146066e7cc45a0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF acts as a link farm, pointing to numerous potentially compromised or disposable hosting domains, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://esebtekstil.com/resimler/files/pisirek.pdf In PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/22601683719.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/3027785783.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/freg2qj4o6ueao20t9h43sec4i/1303553055.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/88692482154.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161467e7dd2e22---55368343907.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/gukawujunolivegomibax.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/rubulujoxidud.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/2904740389.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/peful.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/12351898185.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133985fbe2e4---66918378757.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/1808115747.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/bamamobamoz.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/bawewavudapavuxokeriwa.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/17965459294.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/84252918474.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/64040978232.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/pujowokalefebibososibul.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d1258ca4---kafofevujefexiburoko.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/wunerexizolatozuz.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4143e2c98c5c9ff310b413a4dbba224a/vowalemo.pdfIn PDF document text
    • http://soudureornementalelauziere.com/upload/editor/file/kalinusedexawufeb.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/62930246063.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/jasiworusen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cbse+artificial+intelligence+book+for+class+11+pdfPDF 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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 11112 bytes
SHA-256: 804b3f3abba7ee3ae97aeb7131b3c552f67ddca58d62c408de5f23e2b8bb212e
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 16940 bytes
SHA-256: 71160ff9f94165a75e21780eef20c551d7525963344cd53ce0de8e9a468a7a24