Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03d348f39095d56…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 09:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e5ac4246d81a996c0452dce2550c779 SHA-1: 7f88517a12dd6aa5c6aeeb8cc467e84210f3292a SHA-256: d03d348f39095d5628ec24ae55aa2b344457671055ebde27f6e61f3da0e20745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful content, likely initiated via spearphishing.

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://adec-interiors.net/Uploads/file/balulizi.pdf In PDF document text
    • https://taksis.lv/taksis/userfiles/file/gusuwodozepunujabosino.pdfIn PDF document text
    • https://msiutilities.net/documents/60555049476.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133002b3ac25---radofokowubutugukubi.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jijikito.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/38826289942.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/fitisagotefuwumawukog.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/rudakunobejusi.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/73005438127.pdfIn PDF document text
    • http://trieuduong.com/images/Download/36528822741.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/40196261641.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/58960617769.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109120152413768.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210921204549.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/tewikotugigodida.pdfIn PDF document text
    • https://ijp2.com/contents/files/41969069878.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/99692163336.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613597a4853ec---tebizezunifete.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631256468.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/59018559437.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e30096b5d---45956114265.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/xiligimasisomimazofunej.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/15613790273.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/rifumonopezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+send+text+with+effects+on+androidPDF 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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 10704 bytes
SHA-256: 55fd726411a5ffba3f2a235be88e11ed2500fabddd148efd88ef7e8de70afa28
font_01_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 19400 bytes
SHA-256: 01946f45ff8ff7661ed461464533535e1a5d405a35df5cf9f9a510f6faf88816

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