Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b6d73cd867da7d…

MALICIOUS

PDF

69.4 KB Created: 2021-10-06 17:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e267c580b69394f4782c9433c6d8f43 SHA-1: 52eed7793c94dcc01822a29416dce85f8850c3b8 SHA-256: f5b6d73cd867da7d59a99f1361e92977ec84d0f0b0790c099a39ce2140366802
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://queure.ru/uplcv?utm_term=hot+women+with+sexy+legs PDF link annotation
    • http://cngwalk.com/fckeditor/userfiles/image/46584010109.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/tosulurajozew.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486e7da29b6---xodirovusipodoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161557910bba57---xapopufu.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/35604647559.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/20116629965.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615676574952c---39640342421.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/fozajuwemodukuze.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/niseguvovavafasapeku.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k5vf091s3v5rckofihf24dh61u/rilovefitudefoxolebesib.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/10465238711.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/fekaduxanadavazidodujuke.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/82002735507.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/92240097817.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/nazabogepexig.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615ae7bf081d1---tujobiraligajejan.pdfIn PDF document text
    • http://inistor.com/ufiles/files/relekixugimu.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/89880570999.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/15857970017.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/toxup.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e2a869ec50a866f337eb12c09dc1d260/nijijezefuberazunotomaxa.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///kolovabepakugo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4b97d2fe---nupowowan.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_off0000b1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C9 10588 bytes
SHA-256: a7c6832def76b413bae2cde96db324d93743ae42515719e67b529346c5187aab
font_01_sfnt_off0000c9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C9 15248 bytes
SHA-256: 300ac01928928f34796e0428904185a3e1d175ead6ec699ebfe3ef296701e68d
font_02_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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