Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd8fa87e660a92b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 00:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccc9dccb2bdd7c8b324e8b0c4b800fab SHA-1: 8e64e8ec62f680ecd734577a5b00a1f9a9b3b1ee SHA-256: 4bd8fa87e660a92bf1cee3b866ba3f197fb55d85e72011908f031bd30330cd80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ad77857971e2b9cdf72a62da270f68ef/41104456963.pdf In PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/1324113278.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/pezojazepesaburuxotimerim.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/14318458925.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/xakovuvegorefi.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61142eb5d---wuzuvadozuraduli.pdfIn PDF document text
    • https://olterus.com/contents//files/kebomomem.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc34506cc7---64257881618.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zutuzefamirix.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b0fa545f---jujusutijopuxumimerodolek.pdfIn PDF document text
    • http://kaies.cn/upfiles/210525022328791018nlj909.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/35901297317.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1050e3b758e92747617fca2fdb0c4d54/sivemo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c924a3115e4---jovaji.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/53436524822.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904ee46ef0c---rujezulidudefuwonu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3d4a7e39bf41833a9f3b33865738b456/jazaxoromapumiwegora.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/69a48453f607425bc03af89b507252d0/lexerubifixefimadigak.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/32964969722.pdfIn PDF document text
    • http://ahchala.com/img/file/salabetosot.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/67tnc3lknae5mpkppvsggids96/70466078565.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/megijidojeporimoli.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f85ecf67ca5---34065998246.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/sosimegowukupodupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=which+fat+is+healthy+saturated+or+unsaturatedPDF 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_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 10780 bytes
SHA-256: a9f116ab157f6b19fb4df1cce13d7423dd757fc0cdeb6d0e2241b3d331fbcf22
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 16796 bytes
SHA-256: 99342a314bb3d641f96e15880409d79a8ef8594e1092af4b65181b0565c4c39f
font_02_sfnt_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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