Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a31a40a468e1241…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 17:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11f544f235a50f7e9831b02b920e4157 SHA-1: 1886309d2cf6250cf5a1fe1f3a6638f1a6335870 SHA-256: 5a31a40a468e1241baa061f9fde4e26d1a674a36e22f0a8b2acae83b80021902
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit users.

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 https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/k51b8jttf67f0gpiobmidnssam/manipogoxeweno.pdf In PDF document text
    • http://skupka23.ru/upload/m/96229094148.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/gowelimefijifogemekile.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/31334578279.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5e8c6244c---55634650432.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0f34ba3d3---nixamadoxelewetowam.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7d953db1---17722846816.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/tepawawabileravalevof.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/23646318204.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c508a6aec7---60154315137.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/eb5fde59d6b5e19fec8ab5d05f688746/fadizutu.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/21064741753.pdfIn PDF document text
    • http://sun-tes.ru/files/file/pilof.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80685eb81---fufegumajatu.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/liwadiw.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/97734915345.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af89da71055---242609910.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/dixetadesodeti.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/mekerijunaledul.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/33556778781.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/kajebidiba.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/vevizola.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/17635865514.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/11490169746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rational+vs+irrational+worksheet+pdfPDF 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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 10884 bytes
SHA-256: b0e7336f4ff189a3697d11599c0b62ef52ad1f7525c937f5b17e5da428c179cb
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 18752 bytes
SHA-256: 02e1077cfb6ba61c4869d59f4968352636d9ebd10e7319a2aff9053e88d3b480
font_02_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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