Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3fe9d7eab8d125…

MALICIOUS

PDF

93.6 KB Created: 2021-07-25 17:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdfdf7bb864dca21741d9a877ed37b33 SHA-1: 81ffcfd30cd1184e9af7aeda1580b1664e731227 SHA-256: 7f3fe9d7eab8d12588cbf1a091cb19cf2c764cade03a415c8f1fdc1ed2a529cb
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to host or distribute further malicious content. The presence of numerous distinct hosts and the use of UTM parameters in some URLs indicate a coordinated effort to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee24d785226---70076256515.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160801959afac3---tidowopodalolosiguwuw.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/kedokawifaguzosowegedu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d625a2b559---30525996833.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/fd6a4b9a9b83f553aab0da49d3102657/53926501676.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/39308688914.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85530d1be---vajevuwafe.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ac2c1852---84654251194.pdfIn PDF document text
    • http://kfbi.ru/content/file/lotunufigadokeruva.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/58ohpuho7otpuhpho2mj6vsc61/86189007813.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c0553ed0389---66329131030.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5bef1545a9ca7db8b98dd12969423b05/55866088793.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/18182282776.pdfIn PDF document text
    • https://medtek.vn/storage/file/35603331001.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4b4355f1d7607318798185a68d70d75f/29075148186.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/u4q9isjbed0mjns8iq8u2e05mr/molejuragazepifutem.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/62857130442.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/48bcf820972030e602d9d2085c926176/65957771572.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a6389fc90---geminivokitave.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/42235976851.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9si32sc9pnskl26k31up128b53/dokiripepotagofexesusikod.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f0fc1e23a448356b64442826e5331ffa/wotilapeki.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607880ca31880---55776967351.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/giwovenazomasabubiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dr+fone+iphone+full+megaPDF 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_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 10640 bytes
SHA-256: b150bb2eba14524c106c63ed302813bb09b8c77ed028253c73bdd9d8692baec7
font_02_sfnt_off00013764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13764 18192 bytes
SHA-256: f810e1246317a428909e4c1c59078c6b8b660fc5ba7ec96e1d100fc60c8265d8

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