Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dd591fabde82c8…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 11:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c002f46f82ad1de3e9805926d0710e38 SHA-1: b2a0f9d00ca172575051f6a179bcd7be069ad469 SHA-256: 98dd591fabde82c8eb20e1efd188393dcb8bcb3fe518243e76f84d3ca892312a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The primary purpose appears to be redirecting users to external sites, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=taxi+driver+full+movie+free+online PDF link annotation
    • http://naturestuff.nl/siteimages/file/84655456339.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/84352141658.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/xoseduxufedegala.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/xevijotovamen.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/be76ae8ff2d57ffdc7819567d3c9b971/nunaxeloxig.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/wiwobamevebinugig.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/92719883687.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b557b2f58---pofijunurulenakitovapisan.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/6938938774.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/mafotinuz.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wabepunubefepi.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/4831464537.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/fudawiraleworavugabi.pdfIn PDF document text
    • http://etkenkalip.com/files/82324996989.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/3618124774.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2k9kps31rb8ecoqi5v1g2smfu3/bojutez.pdfIn PDF document text
    • https://samudra99.com/contents/files/22974745824.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/dajiwilafebunivegata.pdfIn PDF document text
    • https://mediaskills.rs/files/30767909911.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jofokotosetububulurog.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/43519700119.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/30665034411.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_off0000c002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC002 10480 bytes
SHA-256: 7e56ee435d7c09798e9de9c1b21931a24778b43458d979b4f7fd659d46a0bb5d
font_01_sfnt_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 18124 bytes
SHA-256: eb9399cc028403e00934e48341751515bcf5a1296d01cbeb2d14da854d4dbc1e
font_02_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1