Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b693e199997834…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 18:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ee3065a273714f9c796cbcb86523169 SHA-1: ac5ee70470869da8e3c1e514ca17a50f0189ab45 SHA-256: f3b693e1999978348962bae2f6996f64d299996e1f2ec414540261b05086c809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress upload directories. The presence of 'utm_term' parameters in some URLs suggests a potential phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=real+drift+car+driving+master+mod+apk PDF link annotation
    • http://smartwealthhk.com/userfiles/nibamotuzezaxerituli.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/dukosibegasubalibul.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/61315658676.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/gavovavi.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/bebibuji.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677f5b0d56---35693960024.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300bc8f4047---4400753462.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/bewivug.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/mobarax.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/momamuxajisi.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/25878327642.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/jisaxonenigidugikasuloko.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e195d7cc---34315111965.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090811491273499.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/zopitanesi.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/rixogeki.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/metolapumanafowuvujer.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/30057805768.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/tubevozunamut.pdfIn PDF document text
    • http://sakem.org/userfiles/files/51832121258.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a5791a4f---birikivulivuvovolupetijul.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/98645756055.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/tazelewekamajafuja.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/sefusumiroxi.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/xajubabuwojugib.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_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 11168 bytes
SHA-256: 9f903da6f2c0d004759a385c3ab657698fcb5c2d3aa53c4a5170203d8a103ee6
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 17264 bytes
SHA-256: 672eaaebe8f9c924db55781b7588381cb248198881a41ec029713f42b0f652e8
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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