Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1709944ff6f8d1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 14:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 596211f18b3028d173f02da826977e5a SHA-1: cbc504146b9f65c502413177fd0fc78f6a64e12d SHA-256: ae1709944ff6f8d181ce45855772aaa295cff95c2731887937bcabef78e0e152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=steel+and+flesh+2+new+lands+mod PDF link annotation
    • http://fishtech.org/uploads/userfiles/file/file/delivususodasajomediv.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/mowadaboxewaweremuwidinir.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/21554031834.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/dadilusinolu.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/7942845091.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/xasexadajodokexagebelunoz.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ccec73f7---zatirewizedexebuxaxe.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/16771c5cc362d2a571a7ea68730a817d/lamoga.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/nozofatovixikelilaku.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/xomum.pdfIn PDF document text
    • http://prograsifkalip.com/files/41494165472.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/sixitumumafalawefin.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/79869028432.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/50517032439.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/wakizawefolilewiduteter.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/15360487598.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/dekifirotubokamev.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/bixubusavixafurav.pdfIn PDF document text
    • http://haai.org/upload/file/jetapopidedaxogedobap.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/6283591623.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/vipivot.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/cf5dd5c477d060e4b1cbcc6e2bd9b7b7/gewirovunesemesefere.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/80777658770.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_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 19900 bytes
SHA-256: 24674cd0a9a303279cc0c2a0657c0e66a39023df8a05e4adb9031826a91d30ce
font_02_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 10708 bytes
SHA-256: 0f8ba5f0556513c80962d23a9cd5c3d218d6f547978b475d1b2b4f389f4f5aea