Malicious PDF — malware analysis report

Static analysis result for SHA-256 25980ced0c204b37…

MALICIOUS

PDF

100.6 KB Created: 2021-09-03 23:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a7a21938c06b16411b3276b04af2cab SHA-1: 6b010b964c2c8e0b82a47c9946af2fecaf20e343 SHA-256: 25980ced0c204b372c59b47f9fada5f0210894ec7264419d42cb5247a2ba30c9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://snp-ent.com/files/fckeditor/file/9262305536109d7ddaec99.pdf In PDF document text
    • https://abe-rdc.com/userfiles/file/rikiwodetanelum.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202108262331027674.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/897d744eda41e3008dfdaea1648c623b/zijutilenititimo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/88678777057.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/wularu.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/72591688658.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/suvufonabavapizewitab.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6ffbcba7---filunotedezadoxepesege.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/24336531136.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6ff7cfe81c99f7542547559b9fbb1ba6/97623961432.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/98795603914.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9cfe36ee---pabudapitebawofo.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/31048576368.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/neruxesokuxawogoledimuxit.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/21843338713.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/vitofokipuwifuvumomitunud.pdfIn PDF document text
    • http://imbirimbir.ru/files/repogatodirasiravi.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e20bcd1669319be8bb4b5a12a7791c13/22709355414.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/lexar.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/93200238709.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f324c4c449---76191898029.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083604c7b385---82434766462.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/84772732464.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/woxorozede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=b+braun+infusion+pump+infusomat+p+service+manualPDF 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_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C77 11000 bytes
SHA-256: 5ee285c3847d16c3577168de5edaa95e18198d85f28cf1be6a572a9522d668c0
font_02_sfnt_off000155df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DF 17924 bytes
SHA-256: 3ce1a83639477e8cef87cf1a4abc356596f04171a1f619e0aae068044c38b1d9

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