Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fabac181bf08ea…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 04:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ccea3b79a78745265ad9aaa8185ef882 SHA-1: 77787783a7e2cb6e2e24633f7e57a9861908376b SHA-256: f6fabac181bf08eaecfb2e6154b0698f75278513133d6f9aa5595aed14b4251c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to lure users to malicious content. The presence of embedded JavaScript further supports the malicious intent, likely to facilitate exploitation or redirection. ClamAV detection as Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0 confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=big+little+farmer+apk+download PDF link annotation
    • http://www.deep2001.com/images/library/File/68998132355.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/rekixufudodat.pdfIn PDF document text
    • http://japhina.com/upload/file/jokobilamiwisidiwuzu.pdfIn PDF document text
    • https://cian.hr/userfiles/file/fiwewavafobopiweg.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161307748e5911---kokebew.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/taxobivofof.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ad60dc6b---kinamapilegijidesibus.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/45988796015.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/lipadowurapifupiwanozexi.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/37329499683.pdfIn PDF document text
    • http://delve-cr.com/uploads/naduviwebefediwiwumu.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109132023462096.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f423efd6---64365260397.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/75716711948.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/37039451400.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/ribopaduvaxam.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/podalaw.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/pofegagekipizirip.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109061420111010.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/32919867235.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/rotifuvulavovojugizid.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/26448198360.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/12f2cf3a85ddfac2bb19a7945d547de9/89463314875.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/34991853540.pdfIn PDF document text
    • https://everestart.com/images/stories/file/33112622121.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/fenosimavuvekose.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/98893000445.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_off0000beaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 10904 bytes
SHA-256: 709b44764728be5f17046585ef7ee8be798f894317d3d9a4483da2f0947647c6
font_02_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16808 bytes
SHA-256: d43ef73e053445602608f25adc53154cc75b20976683c0ac28575699533453f9