Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aba0512d31b3c9f…

MALICIOUS

PDF

112.0 KB Created: 2021-08-17 19:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 52cfbe00fa3514fcc582f3a4dd957278 SHA-1: 2511abe1ec9f98566e07feb51dd79f0890579071 SHA-256: 2aba0512d31b3c9f04a95a9b3f3022416db66956f6486a4a962b7d1d5bc08a04
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the extensive use of compromised hosting for link distribution is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=ventajas+y+desventajas+de+los+buscadores+academicos+especializados PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1731d5bfb9---196026798.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/badujujoxog.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/51154254838.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/11654174367.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a235a863e8c---31105937850.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/23880280826.pdfIn PDF document text
    • https://naoshima-habitant.com/48521164178.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bfd9456ea---20150469048.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9roukvrsodlq8ja1nl71doqi5f/sirazudazarame.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/33km5h3ts42ddas5jqn7f8jcgf/gumofusiwos.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/15277376913.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/3222905145.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/wevudok.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/76792997935.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/77735947872.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/28242211662.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2bd7957b---pevovigibadufakapi.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/29370462423.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/tevamogapad.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/92652354781.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/97073153489.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/801c0bc7cc490c9db5fccae8ef6d2c53/todugonizodemopizuguzubo.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xidowanenepewam.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c26b49e0d91---95130993267.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/jenososokevabe.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_off00014b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5F 11256 bytes
SHA-256: 3dc4a834de8a874ae93689ceb69fd39fcd570536ccb2e204aa92c8604c5a6d66
font_01_sfnt_off0001659d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1659D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DAF 18848 bytes
SHA-256: 36aad18dc799e5289a5eadd4970e7abd2e876124fd82e29f26821ebf3972cbfc

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