Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca8956effd7e3e9…

MALICIOUS

PDF

119.1 KB Created: 2021-07-04 02:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: afd4ba7a59e9cf91ee307989401fecb3 SHA-1: 1c0700c678f827261ed72dab7b84fca7f747bfea SHA-256: dca8956effd7e3e9b0582c6d5b27214ce563728774e0bbeab7dde6a3b587a1ca
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised websites and potentially disposable hosting. The document's content, though heavily obfuscated, suggests a lure for recovery secrets or private keys, aligning with phishing tactics. No scripts were extracted, but the presence of numerous external URLs and the 'SE_SECRET_RECOVERY_LURE' heuristic strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://garglob.ru/uplcv?utm_term=oracle+server+architecture+pdf PDF link annotation
    • https://sindonis.com/userfiles/file/2708908412.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/805f57de52072e1cbfd37273af85037f/telunasudoxetip.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608754ef26bea---22985808505.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b801f3e7f59422aaaacf3c1ada9ed9ff/47320449399.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2911019d52---bofeveje.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/t8c9d39c0qrhrap1asjsv9acr2/61381625487.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd820f633---13080189497.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eb7a53d05---lobagi.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/58531791559.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607abdaa9300f---mitusademolevefokejer.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ecfe8ed7a---3018285506.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/xakixivazojazodozu.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/pobiboti.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d32301756821dec39c0a5537ad795a38/xitikajivomobi.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/voxokowukakazik.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970f4b0f968---wunosejo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c26fd4adba4a9387b74c64da73dd41c/sijiv.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/64400530095.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ca13d21b---51654153282.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6chm7bgl4cfg00deamhio38346/watagadafuxatufufij.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9fba3a8d5---xapiniga.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865cb042bfc---42820552905.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e620d23ec---bimikuvuriduxopogituxifo.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/10799225569.pdfIn 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://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_off00016f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F57 10684 bytes
SHA-256: a7e012db885f5bc7a4df46438bb577b96d3e2bd0f66e655ee23caaf19af1d24d
font_01_sfnt_off0001880f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1880F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A021 17876 bytes
SHA-256: a7ae0075e3191d6db4867e8ba537f44cba138cd2d9971765577b1dc6299277fe

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