Malicious PDF — malware analysis report

Static analysis result for SHA-256 44729d7fef087bf0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 20:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7e199b336029aa4e518bd72181da212 SHA-1: cf14443c2d27c3d913d66bf6b6fedeac58c95e7a SHA-256: 44729d7fef087bf04e68e435848691fcfc88024811256c475d74cea86d2028f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://begues.mobi/userfiles/file/21084016994.pdf In PDF document text
    • https://szallas-karpatalja.net/upload/50578243326.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/buwezani.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/rubivetep.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c198355383---kuzagukexasufamagigizul.pdfIn PDF document text
    • http://1careglobal.com/upload/files/81952457843.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312fa30d441---23697817119.pdfIn PDF document text
    • http://sparkpro.lv/content/file/29099896824.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/67803262519.pdfIn PDF document text
    • http://bienbao.net/uploads/files/duwozulalidumewexe.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/86032799569.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78029079111.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/zudegegopomawudobupi.pdfIn PDF document text
    • http://soles2walk.com/data/file/39715923691.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/faginelabajewefusi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382abb8bfb3---68920787511.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/dujevigupim.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/96239716374.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/45323521928.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/26961969347.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/35037220732.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/53348732702.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/zuxoraribawuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+drawing+apps+free+androidPDF 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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 10768 bytes
SHA-256: 11ef976be635fc23556ce24e988ff9d6feee178a1e9971b5995e69827b50ec70
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 17276 bytes
SHA-256: ee62245c1018342095fe569b4fe143d6ae4f996e21f969caecc91547f94b95d8

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