Malicious PDF — malware analysis report

Static analysis result for SHA-256 053783129306ed05…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 12:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e09cbe71e76ac1ebc717ce92cd46f122 SHA-1: 5360a0ceaabbc623b91a32e1435b2e656bfd257d SHA-256: 053783129306ed0540c266782c8eacb69c4b71ce2bc2275becd55b77e7e7b34f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=best+offline+crime+games+for+android PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1aea7cd3---pakisumodutikiferasesatud.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/22917379075.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64f3283f0---16535456704.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/mesalotitatosaxixit.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/4318937770.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e5fccc7c---62059062543.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/5672528321.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/15452924142.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/84607619734.pdfIn PDF document text
    • http://afslab.asia/upload/files/rerapefa.pdfIn PDF document text
    • https://agermag.ro/mm/file/80400785658.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/penizakiloderowam.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/wetuzif.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/velaxibasibabekuzejeliko.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/17893930873.pdfIn PDF document text
    • http://zubrcup.by/files/files/dililejijekerebijuvovu.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/69585107804.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/67472986003.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/13289454182.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e365b96e---bawapatotu.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/sajum.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/30307713117.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/86054464180.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/058c5396a7ea2bb3565d9fda9c958a68/jatasojewudadaxetuw.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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 10872 bytes
SHA-256: a13aeadf448b07d5a71585b14bad77f953dcd1f9918d132bfb9076d8905f4ed9
font_01_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 17720 bytes
SHA-256: 0b0abd489779cacad9f2bdc7c17bbd013c4ed9f3f698e12519e2de5d17102ea7
font_02_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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