Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b2a87f8e92d027…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 13:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67386262d323be853cae2759c2d99983 SHA-1: c3c2818db03860aa67bf55b996cc9ddf55d0c136 SHA-256: b1b2a87f8e92d02767dfef73ffef209616eb736d87f0e2aec8d659d73f0c6873
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple unknown domains, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://squarcialupirelaxinchianti.com/writable/public/userfiles/file/29072113411.pdf In PDF document text
    • http://whuntex.info/userfiles/file/86941962766.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/55833719660.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/70407334913.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/70206577829.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/54646453871.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/firebuwekozavizuxakowolun.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3e71f3c0d---79016481458.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/kopanamugatomelujerawub.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/wafobujarutu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5565c30f37b6dde9e45d48e0d9d0a3ce/90666758021.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/40017187520.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/63847839431.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79977166434.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148bb2d7f482---22732594910.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/87551913078.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/92068661464.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ef155cf7---tojifovakolisipuposoti.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/xawuxosamuziwikosapur.pdfIn PDF document text
    • http://sinoorchids.com/image/file/vitel.pdfIn PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/segupiverise.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/lasiredixumika.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422db48f1ca---5371904995.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/94195238645.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85b91160a---lotiwi.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/bewepomusobiwotikiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=one+flew+over+the+cuckoo%27s+nest+full+movie+freePDF 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_off0000b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 10844 bytes
SHA-256: 56bb3b68bac09aabfd4fc8f2f18b15c69b949d056ebf8680a645bd6184887cc8
font_02_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 16872 bytes
SHA-256: 49a7b1db129c7c3341eedb3fca078b4b5f41617da15d074ff6aab0ffd0e4034c

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