Malicious PDF — malware analysis report

Static analysis result for SHA-256 2862504c3003cc7b…

MALICIOUS

PDF

93.6 KB Created: 2021-09-09 03:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5a019e4d563e4f4becf5fe5b8c3ad35 SHA-1: fc75e8b30106d2d09e7fca4d812093ff0193e0c7 SHA-256: 2862504c3003cc7ba4f44ce2c850dd9406116c0a3f66d13ed04722e5ec4ce5eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://krisoc.ru/uplcv?utm_term=new+bollywood+full+movies+2020+download PDF link annotation
    • http://themetamorphoseprogram.com/userfiles/file/xebegujijevetiledi.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/52490245200.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/kakuvisuneputamagelurewej.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/15f8d3eb4311bb51d9934e85d34e75c4/pulizuge.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/vobagenuteluxuwaba.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/20761694100.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130634bbbe32---49286012279.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/8042869704.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/mimowedawasoni.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/mejov.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/sowak.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/nemol.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/83644325659.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/vakedujib.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/83858221448.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zepikugo.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/93670947695.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334b120913c---44189486608.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613147b1dcce3---69831375749.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/82649348283.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/nudebozewufakoxex.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/45405939345.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210903154810_eeatrs.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_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 11044 bytes
SHA-256: 489b7a5e84b4e12cacc43b41ab0319dc1de9a5031531fe0a85c503bc74b4065c
font_01_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B71 17388 bytes
SHA-256: 948ef563507e8fa0e72d80bf224a5556a6758e3e1cbd35629ae466221ec76d4a