Malicious PDF — malware analysis report

Static analysis result for SHA-256 b377a4ab49348c22…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 11:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ca460bef27a9e3ae445056b87551049 SHA-1: b8c388ba318fb55012b76f9ed44e30cadb83486b SHA-256: b377a4ab49348c22f51ab8f012ca5ec2edfce711f54946f056f7fd679ea75b11
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and the presence of multiple external URIs align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=ncert+science+book+class+8+solutions+free+download+pdf PDF link annotation
    • http://accessiblevehicleservices.com/userfiles/file/14804455231.pdfIn PDF document text
    • https://turbooto.vn/upload/files/70015051386.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/7469262056.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/12831053664.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/newodimugutexawunupenefi.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/wojojazesojaxasurotik.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/76409925046.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/movobebibitiw.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0bb89815741149d293df07611a071e26/37198462011.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/jotujigak.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/bukozuve.pdfIn PDF document text
    • https://mikludava.lt/images/files/85088796068.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/80875713130.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/97796695058.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/5b41fedbc02b36e8fd81a62d279d01a5/vudijibezunobununotiloko.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/borukikowusoparademu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a125f6cce60---95805596856.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8975800e5c---26030585960.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d594135835---kofogami.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/tuzoji.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/kitegemaxujakafelukepofit.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dokawesuxobamixut.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_off0000bbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE4 11216 bytes
SHA-256: e2672bc5a395e8a12115752a02e02485c80daf5306506f289fe6125efac1d6a4
font_01_sfnt_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 18760 bytes
SHA-256: f9763c031c9b9ed65d2b235a5b4d7e4c65df26ef947e3945e61995ae47897d5a

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