Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cc0f5db5ed1788…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 16:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb7b82cc6259bb7b888b984313166384 SHA-1: 931dcb84e2ce1bc0ce2cc7ffd7aca104ce54ce6c SHA-256: 70cc0f5db5ed17888ae5522a90078c0705d16b2c16e1479c112d9f60c38a8b6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host a large number of links, likely to evade detection and spread malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0pb97h857ch54dj19c8mhbd47l/bolupevevakup.pdf In PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/rusigejixusu.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/reguxojonesed.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/rutaku.pdfIn PDF document text
    • http://wamer.org/userfiles/file/pepivotizit.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425112187d4---78191282612.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/58505005057.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/29518977332.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/rixesakew.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/popegenunujod.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/40690067670.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/98768931956.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/tilonelemuboviva.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/3790846272.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/wopulesobeb.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/34124029243.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/ganabafezuxugijuroxowe.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/zuzezak.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/47767777319.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc6a82f13---wosumebikalora.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/wuwis.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/36141540499.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/15569624259.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/75382008532.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/modinagijarinava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=oreo+live+match+appPDF 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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 18032 bytes
SHA-256: be5f65d1a5cb3b1bfa547a5badb022027ce434ddbd3a2234328d8d6d9266e4f0
font_01_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12807 10456 bytes
SHA-256: ffa1903907acdf7081b261a19412f21ff0534c83699994c3d288974a9546d01d

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