Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e06c5796e7c3c2…

MALICIOUS

PDF

72.4 KB Created: 2021-10-04 10:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a8de1cb002f66a4559c2fdc6b8c94208 SHA-1: 73f004dd7dc0a5cf37420f380379c3cd7b8b8f02 SHA-256: 93e06c5796e7c3c22bd84665b455b87fb3397995a631b48a4257baa795e203c3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. No scripts were extracted, but the overall structure and URL analysis strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://fedico.ca/upload/editor/file/zojezavunidoranef.pdf In PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/koxanupogawojatimimafe.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/fonerara.pdfIn PDF document text
    • http://traviet36.com/upload/files/tepumu.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/77900520753.pdfIn PDF document text
    • http://katela.net/userData/board/file/buwevaxosab.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/wewizulapowivozamuxojewo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f965dcbb9f---75111484072.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///sanedetu.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/nopasakotulolaxixubej.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/jirebimumowunelal.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/kifimonaniromun.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/96296012365.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/bewiwobekop.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/fovagepuxiletixevijuropo.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/vukememosesidu.pdfIn PDF document text
    • https://hinaweb.com/upload/file/kefubejutagenuvujawa.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/kuluputaxosenabato.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/zijude.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/70563412849.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb27674206---tiwekifixorazuwo.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/sasupuxamuzigigulu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b1aa5804---33664007362.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/remeno.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/83066686450.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613952666a698---59222271192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+elegance+banqueting+suitePDF 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_off0000b558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB558 18284 bytes
SHA-256: 3f367438d18c292f5e7a13549f1d89c6afd98d20088791a93129be0cf5cfe02d
font_01_sfnt_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 10640 bytes
SHA-256: 83cb973a68ea0c0492562f0a072cdae97b4e5e5f3be781d2f438c5cea26fa133
font_02_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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