Malicious PDF — malware analysis report

Static analysis result for SHA-256 c608bc612aaaff7a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 03:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a8d70d24949b1d6269a1628f834de12 SHA-1: dd5f0cd7b6bb2220beab7c6616148967a66bdad8 SHA-256: c608bc612aaaff7aaa03efa166d9a195fff3b8a8eb740a576ed6392f2d2f2082
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to external sites, indicating a phishing or malware distribution attempt. The file's structure suggests it acts as a link farm, directing users to potentially compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://philabc.ru/uplcv?utm_term=consumable+and+non+consumable PDF link annotation
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210805081621.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8f2ca554c4a9fddd23c293bbbfe0216f/gavasuzifunibapezis.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/99395741328.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/95827764985.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160724b419d659---xumufukosulodarofodi.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/71213737524.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16089d275f2cbd---zalapemewasewa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fuberowetatuwagodixuvoj.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/89032323854.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/59851681106.pdfIn PDF document text
    • http://chipgene.com/image/files/20210816_195612.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/13470207866.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aca77f94127---37213931620.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/03cef447d95cc7f38cfd5339a71ec69b/xodurufozopeme.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be2b2ffdd---lamulibasafip.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/nufokujidaxaw.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/15794559951.pdfIn PDF document text
    • http://kd-council.com/upfile/files/7235088615.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/72268351249.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/72007209215.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b05bc61523---nifijunajewi.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/92559296058.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d6631450ae7bce49379d79dd14d95ddb/9618703310.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/5vnnll7ve6o27c5pje853elpk3/pususifuxufalatizup.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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10512 bytes
SHA-256: c69a74dfd0220d174249e8a90c7e59f004690de328fe38cb461d30de7de8d109
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 16700 bytes
SHA-256: e131127a725d1c6e9f71d2b1343b6b48ae6807ad03227650abd3366a2e2d99b7

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