Malicious PDF — malware analysis report

Static analysis result for SHA-256 826e6eceaf87bedc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 05:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efb61f9d1e9e84f42690c47808328e83 SHA-1: e8549616d8cccf64f0794195334994291512f524 SHA-256: 826e6eceaf87bedce7191a6de500ea1070e8f3d4ea2a2b9d2d2d9c26cd92fa65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://scouttautomotive.com/editor_uploads/system/files/dajalimunasikomoganif.pdf In PDF document text
    • http://campfirewtx.org/userfiles/file/71493144158.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/21541615738.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/funosatipoj.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cfca9558f---sobaxivilutibuw.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/77765221880.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/dosivinar.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/risaw.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/bufepomurefepuzuti.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/3886792394.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317a16b2c7e---wevuwosemo.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/42237314564.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/giroj.pdfIn PDF document text
    • http://jar-ted.pl/file/zaniniwenu.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1161224549.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/98335149403.pdfIn PDF document text
    • https://deepex.hu/hirek/files/48788629647.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xalixazotokezimojek.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xerixarega.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109012102521029.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/29912294723.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/serovajusizumiliwe.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7e11cc89---97208459762.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/palum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=top+ten+most+populated+countries+2020PDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10980 bytes
SHA-256: 047be76d8186ae9107c2f3616a493331daf890ba9913281e52e966a726465392
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 17488 bytes
SHA-256: 5c5736d760407728e70c0c0dce5771d1f6905206d590a437ef3d31606b120e05