Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a82b031c8cf7bb…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 19:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 267911e0d4d479700574373c6bd56cf6 SHA-1: 4e35f7a4f9516d8d697ba8573d8dc22c9f23327f SHA-256: 96a82b031c8cf7bb3e812f3c5b9fdf79e3bc923d3c7d1b50aa88fd07fbeb38e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which appear to be disposable or compromised, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=infidelity+in+suburbia+full+movie+online+123movies PDF link annotation
    • https://chiuman-hk.com/images/file/leselajuzopadiz.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/guzaz.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/99956978313.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/31754476713.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/niwadazexotexokib.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/91523031377.pdfIn PDF document text
    • http://konberdbio.com/upload/files/nunidebaja.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/69449948587.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338334b62d3---3608122791.pdfIn PDF document text
    • http://pb-book.com/user_file/file/dezateg.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/48366724390.pdfIn PDF document text
    • http://vitrine-prof.com/files/nutesovadewimowixureketor.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/lolezewitugilabeweluli.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/94956882070.pdfIn PDF document text
    • http://henca.com/files/details/file/2832446566.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614356b8e9a80---valifivotibefosumidevuw.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/mofixareris.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/xaletogap.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0472c06d4482b11de5d831c28e499d26/wugitimuwevinokufu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320883617c7---xetegovejiv.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/dobituniwi.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/bunosusoxevipuxukinozif.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc3732fdfb---63468681783.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/11131882532.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/7962077739.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/jidutokod.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_off0000bff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 18912 bytes
SHA-256: f297c002cdfa263fbacc85af8834bc0576d459c1c9be5f9052e46245bb24a78f
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 11232 bytes
SHA-256: 0b1aeb9379368a5684fe60e59912b8f2aa395cdeb40c9de5f270a94cc6ca81ee
font_02_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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