Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef926e8846b7877…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 11:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d29a57af87f5dc1b8ce0d66528da3a97 SHA-1: ce340b9a8a35deb6959c597f31e111772b018352 SHA-256: cef926e8846b7877887fdc0eedd6339a073fb976301048ca567c96ca3899d83d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URLs, including those hosted on compromised CMS uploads and disposable domains, strongly suggests a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=ayn+rand+fountainhead+telugu+pdf PDF link annotation
    • https://dadesigning.com/daduserfiles/files/giwokenadevupujajo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gudezunamesofotuvenukuzo.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/fufit.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cnsupeeus4v04trlr7mummmqag/99341750232.pdfIn PDF document text
    • http://zubrcup.by/files/files/kepulafumitafimetixej.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/vimenozikekaduguxuxijow.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/13047245925.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xidopanodunijidepamu.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/81768355328.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/95728227478.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/20351892769.pdfIn PDF document text
    • http://tzsunup.com/upload/fasazomibabifa.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/36149173160.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mavunn0c9r4stequoujgh0ufos/39661577030.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/jafovoja.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905012255101279dg8fw4.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/tirukum.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e1201c46c604b03fc1cae74b73dbd49/ferenafos.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/xumazudimubumupomevejofe.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/47325395662.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/nokefogo.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/97940594310.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/binuxizizefarovura.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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 10804 bytes
SHA-256: 8f50957e6c48453f82bd9c14df2e068caea8a723324a0df1855702deb2e20366
font_02_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 18416 bytes
SHA-256: 36ab4a43318f827d07f173ed9035dce00938b66996a97ff30bd95db5107d050a

Open this report in the interactive analyzer, or submit your own file for analysis.