Malicious PDF — malware analysis report

Static analysis result for SHA-256 836abefb788b1ad6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 18:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d6327e2ab5f23d3300256f727485b56 SHA-1: ee6e600c17e4b8fc4f1d69a7b6150991b69a85ed SHA-256: 836abefb788b1ad6a4e0e87f903a0dbcbd5d6d1dc97401b7ff8c8b5e1c354fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://adimhukuk.com/resimler/files/78624867756.pdf In PDF document text
    • https://intrigantka.ru/images/userfiles/file/sifalatetidawerorufapitud.pdfIn PDF document text
    • http://hidropro.hu/upload/rumifes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c7c38c6b---jolejivavo.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/tijiram1631998501.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/31835866682.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/guvudujokulizusumuru.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/80927927617.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/gelorekigegited.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210918010526.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/jofipix.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/39414613601.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/18932550425.pdfIn PDF document text
    • https://jss-moms.si/upload/File/55835704606.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/tikogageda.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916133317870875.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/xawozi.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312c1e4b1a2---41367328687.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pamibawelogefazalij.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/17512959263.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/35438953040.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/vaparuperurezumali.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614430cd0ad28---sudomubapibofanonanidisen.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6fe92385d5413bfd758638baf6938a76/muzukixulijotufu.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/zebifipazaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=screen+snapshot+app+for+androidPDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16488 bytes
SHA-256: aab8342c0a55354dcfc51a1e1427f13bb5374a2b8590af9e22f41c92c8f02b2e
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10748 bytes
SHA-256: 6d70ea9d8b09083d52a3ef8547fa0b571e2f09ac6bcb6318cd4b0b262580c12f
font_02_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1