Malicious PDF — malware analysis report

Static analysis result for SHA-256 38baad0bcc8c6b36…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 05:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: acf92834614684202a9b329d14855af8 SHA-1: a8f3c29fc4017bdb5f2806b53c3e81e5bb46d25c SHA-256: 38baad0bcc8c6b36e86f75d42f5e382de19eb305053b3ed468254a2015c1ac5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://catamma.ru/uplcv?utm_term=placenta+left+in+after+birth PDF link annotation
    • http://ultraljud.nu/bild/files/devirogag.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607670073e1e9---wedenebomitomijimo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/fexakomekibavezifa.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/58130570536.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/fesewidinujajibi.pdfIn PDF document text
    • http://aurora-c.jp/files/files/kiwigunitafiru.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1pvgl9v5fllu6icd2bnn9bgdd4/32152022939.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9ee9c83ee3d18c9d6c6c3392357382c0/tavumusakovizefi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c5b2750ca7263891ddcd458cf9df0a02/64210188262.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/1298521066.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d8ee0f380---75304109453.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/cc8e5acfdcf9dde7ffb21a5a3733c88d/poxenipokudalari.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/90216970433.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ke52ggg4ccinr8tv07o3ujgd03/fedusip.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/96a7c042a15aac8fbe2b3c172e0188b8/67360902462.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210721033613_cmp9jo.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/72125403010.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/notejudemaluxitixuti.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/pilumolavum.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/57964254071.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16127570dec496---82755434499.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zabivejixavo.pdfIn PDF document text
    • https://network-italia.it/file/nifip.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/jukedafaxuviviwadafunub.pdfIn PDF document text
    • http://firegallery.ru/img/upload/bijewokebazitafo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/dorogipivimatijosofekax.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_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 10288 bytes
SHA-256: f99a13a7c764108406267b3ad7a48402a69101db5e95364e59fb29f570368df9
font_02_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 16796 bytes
SHA-256: 1969b2cd49b2657d3e774f86b91671f5a6e4496d4d97385383d95811fdecbae1

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