Malicious PDF — malware analysis report

Static analysis result for SHA-256 699522c7ed747188…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 00:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38ff575e09631de0f3c5830e0343dfd5 SHA-1: 01075d05905d41d0d946bdb224f340dd3d560318 SHA-256: 699522c7ed747188f31f1fd61c721fcd4ef6b6e63574583c9efddc40efd34ae4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of multiple links to potentially malicious or compromised sites suggests an attempt to direct users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://clinicaveterinariasangiacomo.it/userfiles/files/68792034713.pdf In PDF document text
    • https://rmp-traueranzeigen.de/cms/files/89617710973.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8e9a4da1---81415900157.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dabed17c5---jukiwunotuji.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/60406023506.pdfIn PDF document text
    • http://maihome.hu/admin1/file/16000532067.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/tetatimugifolakuvuzuzodi.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/majoj.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/fepav.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/66856222650.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/52731320786.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/befenojidisolunoxozudeje.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6146ebff791d0.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/76879586305.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/watokawuni.pdfIn PDF document text
    • https://aaaxxion.info/images/file/risukeno.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/xonuwewomupejibo.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/76498561567.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dupigezivetubag.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/wijizune.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/dfb6f94b1bc6e39467f5032c15f8aca6/10038022912.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/17670758123.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_195655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=slotomania+free+cardsPDF 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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 18772 bytes
SHA-256: 87a194dccb01d12320751a9c86f74565dbee88caeb4c4745ba079d9f89deeb07
font_01_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 10712 bytes
SHA-256: 307a1129bdef65bac6da81d48c17499cf671018462e43ed8f30e60ba61f9947e
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1