Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2754f01522ea064…

MALICIOUS

PDF

75.2 KB Created: 2021-09-14 01:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 136a6b3947975be185300d85fda322d7 SHA-1: c27a85d7a56c63f6cc586fe22d38cfdb335d253b SHA-256: a2754f01522ea064d0ef0d9e089fbe15761a159affdbe8d2f56a8d20683996f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.rapn.ru/ckfinder/userfiles/files/sovidiwufisiragumirumexuw.pdf In PDF document text
    • http://domplus.su/userfiles/files/lakujunurefef.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/84520273546.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/20284418463.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/63308353013.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/jilogegutitisiwibam.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff9b3cbc2---wakogasidi.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/64498246534.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/48489078437.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/25649191503.pdfIn PDF document text
    • https://finliz.lt/i/File/89108105976.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/netemesanizaminu.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/2589497979.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f9a5a639b26791b603ff4fbe98ea80f7/3390031202.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/9882008415.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///53964178425.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/bukorizetozafinazixivosux.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/37025671634.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/tavesan.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a9e52ec82ca0b1793f0b81a44d5ca762/novigapob.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/javanun.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b74b88a25---gamulajinazibokoxu.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93448143033.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cdd63a5ef9cf64efe15b0cae167cbaf3/lefarisavulebijamo.pdfIn PDF document text
    • http://skisun.it/userfiles/files/xudibe.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/89923285633.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/junadonuzigofelotopedag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=zombie+frontier+3+mod+apk+downloadPDF 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_off0000bf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 10944 bytes
SHA-256: 2ee29fe3445a573100d57ca117a1e455c6b933d0c2c70bd0b6e3d364641bbd97
font_02_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 17820 bytes
SHA-256: 33839595c175668fcbf7520c29f08f1aff32e0c45b5249f05cfa0470a90b7cf7