Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b29a8b787cd3b9…

MALICIOUS

PDF

160.3 KB Created: 2021-06-16 18:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ffbce35b4ae81b8c36a748117024a96e SHA-1: dab2ee0bee09ba6dbf240c78a80398cb0b7dc393 SHA-256: 97b29a8b787cd3b9024bc90010156f292722e4e9eb8d9ea4aaad2ae8cff7f611
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. The embedded URLs likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/uplcv?utm_term=daru+song+status PDF link annotation
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b888377a8de---ninevuvup.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/49937438599.pdfIn PDF document text
    • http://polkovnik.su/upload/file/43811134936.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076187e381d2---lebomowagupufinivufodo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nofu6dqh9kbqlhk8umj43h6adb/jegoriga.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83b57d6316---loditerasogagimone.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf3faa69e8917464d323bae3099438c4/95191363693.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a46248c9e---getidebarise.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5edcf12a9---jawofujadunotawitij.pdfIn PDF document text
    • https://tavio.ru/files/file/suridu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/92u7vnnmjjt99ub83rpccc1717/94594678814.pdfIn PDF document text
    • http://funperm.ru/content/file/kisefabimuto.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/95383689917.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/sederuxaparapiketexaduva.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ua1cafp5f421u661ueq3tf9d06/duvomamalevoxidewetufuwor.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1a44c94c---nadawid.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdd3396c7---niwujomotum.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3272e66f---woxesuwakipis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BC7 4820 bytes
SHA-256: b5a4a085355e93dc6c541f9621c66e0acd0f92d444cd07de5029834e1725c1e1
font_01_sfnt_off00021c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C44 10404 bytes
SHA-256: 8c49c8faae31228c04fc5b0de5b73d79c134af97f51e0303969e5c555059afe7
font_02_sfnt_off00024006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24006 18876 bytes
SHA-256: 18b0ec8cf0782bcf24354f3e4f32441dbef5028be33cf0d6c15235f730127e00

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