Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e08039fa19ff043…

MALICIOUS

PDF

144.6 KB Created: 2021-08-24 00:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abd0703c01247383162dd1e8210ba552 SHA-1: a01ac96470173aecbdb39d6868b3787ef5d01780 SHA-256: 4e08039fa19ff0439ea395dff2ea754fe06cbfe019a9daf20f84a96a2b17995b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and link farms on compromised CMS uploads points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cructi.ru/uplcv?utm_term=indian+automobile+industry+analysis+2019+pdf PDF link annotation
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9eea691a48---15475066450.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/kalisisere.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p8sl7guvvaof42484jsis4e8rp/sovoxigolefirivinawakib.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/68f27db6dc9ac52560971f25b1b9343e/5286360625.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fe8012fb8---dogalezitibe.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad2f60170---zozevaso.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fd650ff3f---18285167652.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/bebanu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160890dd5554bc---38152713913.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17d51cf3b---bojenilinevofawanimumewe.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/resulap.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/a9b0f714bdd9212d07000ed428b076b2/rekaxi.pdfIn PDF document text
    • https://ikansambel.com/contents//files/90924232126.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/38941864108.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045d1a384de---wivinifujajavixabujirepe.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d7ff59377---tijidelenab.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62a8b195ea---tevalezino.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/591759eacd44a73844bbe1bd694aa21f/kaxurijetawiwasebokafit.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90af98379---mefedam.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/quko2u6rmkdfp9bv7icbov57l6/61778162767.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e92308f37e7---35093435350.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/dukefolerozilefamuguse.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62d348e61---1143115058.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_off0001cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E609 18760 bytes
SHA-256: 792acd7a2f519e3abd2cd7b02427e435c9686e369ee58c347ca7fcad166070b5
font_02_sfnt_off000216ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216AB 11424 bytes
SHA-256: 82729e4f32a560144658d08b68c28331b9c70b4f4f93c5447f7e2817295c42da

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