Malicious PDF — malware analysis report

Static analysis result for SHA-256 50652fce34d5ff8c…

MALICIOUS

PDF

75.9 KB Created: 2021-07-18 05:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c3b978ce14bd59fc92d7b3df43240e1 SHA-1: 237c13a7a5784701537dad4c44ad50025c1b8c0a SHA-256: 50652fce34d5ff8c3e5c110bf8ca91b8fb7ea7dee454b0eb3882ede82caf292a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users. The presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://doorsatyrau.com/ckfinder/userfiles/files/64153195896.pdf In PDF document text
    • http://suttonoakfarms.com/clients/880813/File/nezano.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9fd7dd963e561444a1edc5266bbf9e45/46606936005.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/zituruj.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/38402868433.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720b2123486---33161550121.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05a1adb62---2694726048.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9c48ac78---7883481448.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/bf27252ae1c4ddfa122a0621de4d3ad0/tugemilowonifemokevum.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/jevasunofebusawam.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/dumesugepexifudabalatas.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/68grsbgsupev4avlprrsjjm0a4/13233952255.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210603/file/16226872807887.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/650318098a0477719c745e19ae2c91fe/66960970127.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/15011075009.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/mugatewaxovaxutajekafipew.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/9fbc20a9479361bd9706fcf3904834ad/magomupulotula.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/gomonavejasupezerudisuz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d2v1k9ddaf5datbjogl2004fu2/81985656243.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/gedasareruzubajovivibu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/sejumiwafira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+print+housePDF 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_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 10204 bytes
SHA-256: 2f4ff99cd394703b378575ea12f993d9ebfcdea4a21749d1aa3ea91aa31b63fb
font_02_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 16736 bytes
SHA-256: 72f6e3ac411ec9492b0ce7db1cab202f5f084281917f3392e5487ea3a97658cc

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