Malicious PDF — malware analysis report

Static analysis result for SHA-256 8213cd94d5323fa1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 19:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4a5cddb06bb662a6804dca84872a0e0 SHA-1: 5e482cec1df40760f99fd37bf47a99f69427e95c SHA-256: 8213cd94d5323fa165838fefa679041001d24443058baef9038b50997a94c0d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. It also features a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=bike+games+mod+apk PDF link annotation
    • http://toyotacri.com/userfiles/files/87191078351.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/guvok.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/fosanunipubi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/tokadopofotoni.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161370b7478234---19283727612.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/zurur.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/sokogivomutuvomaxomewo.pdfIn PDF document text
    • http://falerisztika.hu/tmp/66913570101.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/pagixuwavexikeka.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109131423596447.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/37364673242.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/palivafusovuwugafexovan.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/zolomupimol.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/tesegonafugokakuvekivivog.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/puxigogibupukulidasogit.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ponigepu.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/tobewekavotepup.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/mivamanorikerunow.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/35834287193.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/59081263944.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/21619202460.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131313bd3a05---lolulogodegelez.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b92a7d90f1423fa9c6b0fb54630bde10/fawazanivotinuvagudanixem.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///60754922698.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_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 10532 bytes
SHA-256: 40924e581eb4af48f0fa29dc4e9c4463d5d4efaab46d046dece2a96bb3e65e92
font_02_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 17720 bytes
SHA-256: 99470de1b68fed9dba77ac4dc820c4d4819c87bfbe7f80ef8f528f13b2a16770

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