Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61ca8903703eff7…

MALICIOUS

PDF

84.4 KB Created: 2021-10-07 06:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 70fc824464fbe620895fc4d90bea6213 SHA-1: e851e71d43443e9ea046e73cb7815fc8efd21899 SHA-256: a61ca8903703eff71331a3580e1f8876095e4cbae8578e4c15e1d64595c5fd11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including one identified as compromised WordPress upload storage, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

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://catamma.ru/uplcv?utm_term=forged+in+fire+season+3+episode+5 PDF link annotation
    • http://egyptlance.com/userfiles/file/mefisalokobusijevodunazug.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/16701888850.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/kilaximaxutapubasonaj.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/61053003593.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/22658238482.pdfIn PDF document text
    • https://digireg.it/upload/furasopiwevuletot.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/fuvidiloneruwutubedol.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/76956968113.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/53233128318.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/woleriwagufebinolugefi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tejudimu.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/17404243507.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec13825e4d---54493603611.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/249272c7de7a5ea500f4f64cc1518db5/70699069301.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/82961532892.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/romerofegeborapufadinogu.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/46803147681.pdfIn PDF document text
    • http://minhanh.com/files/68206180108.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/kabudedituzagoxasiwomavis.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1514c07a8---29624028662.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/70882124408.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/gabepuseputobovuzaludeba.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/59000639283.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/49397285985.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/kulobazasisuridomawemopug.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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 10812 bytes
SHA-256: 4061bb6a1bf374cdb2e5892db098436a078b4fcadedbb53d311a59d72406841a
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 18360 bytes
SHA-256: ff4ddbba26287476f043adb82ccb5dee082176ab4aeca69d9ccd0abcbffe44ca
font_02_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1