Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b65e2c457ce5710…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 06:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b89253f5c1403adbe7f86e5754205c7 SHA-1: 5a626ee9c21f0e9533f7c2ad162ed7ec2eb73b99 SHA-256: 5b65e2c457ce5710abe9ce0a1e0426aab9350775b555936dc1717e634dd0a5e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to various compromised WordPress upload directories and disposable hosting sites, such as 'smidgel.ru', likely to facilitate phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=star+vegas+apk PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2724efcd---64679784767.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/62679035609.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/jatororisawam.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/7673802161.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ad4ec8a8fac2ac75d209321c440de9b0/83476617970.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a4366355---xuketununetinovutumale.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/zixokijesi.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/8443687331.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/ladozegakuzisoter.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338f0825760---benisujorevimow.pdfIn PDF document text
    • http://hidropro.hu/upload/fokonabezifogekarofa.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/45232736154.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/20559354162.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910174940.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614615872d5fb---diwuvegukas.pdfIn PDF document text
    • http://iphysiology.ru/upload/kekide.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u6o0orq36l12n7cspbne0ag66c/75533596262.pdfIn PDF document text
    • https://alohasafaris.com/files/wenovojadola.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/bazuwewolanez.pdfIn PDF document text
    • http://cosyromania.com/media/file/wuwibeguzu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nppcdoaqlk80n9ni5rt5d2i83r/libomex.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e96b930cf---devotup.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/toxelavanarenurabixunal.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/42250637460.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_off0000b267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB267 16736 bytes
SHA-256: ff0f223d522745dfab3bb3c556107ae5b7eb044c03082dbebc7013830a9701b2
font_01_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 10300 bytes
SHA-256: b1f40fea4fbd67e4fb4f566323e3fb0f20bb1d688b6071fe084a81345981b419
font_02_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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