Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f67ff120737da81…

MALICIOUS

PDF

90.7 KB Created: 2021-08-01 21:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 158e9ee0b6b48cc06d09924aa33ea9b1 SHA-1: 8734d40aa7b79992d0c7ec6e3cad349b3fcfd143 SHA-256: 0f67ff120737da81debc71392e5179b25f05fdca3fd0f78dde5f1a77ce629db9
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=sb+game+hacker+apk+new+version PDF link annotation
    • http://zkojicin.cz/userfiles/file/28183310348.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/306ce5c4c4ec73ed46106fc669ee8e80/51519921015.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607241a2178e9---vinumofovatidegujotok.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a923100ca---50725693558.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/kexogunogekoj.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/grbnik8o6ftkhacte15kf98472/55335984192.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160811e5b138b8---8460625964.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/58163653025.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3533b4a9---nimemi.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/75031757166.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b60c21ae---49150560082.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/8791625224.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/43697724203.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/32874582981.pdfIn PDF document text
    • http://geotersrl.it/file/62251624803.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4e08812b49b0f8408e48d5d49218e926/49376738598.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/gufewunemikunofadesonep.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/nidinunozen.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/814496cb0317c423d1d1ac94ca8b752c/92224654864.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mgnorj6ks51dgp4bed60tn4eti/jumunogefenibunadi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6921a3ae---vatozetur.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lebazi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66715836449.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/96441446033.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d30dc942e---kepufal.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b503096ffd25c19d155803534ada2648/xodiduvotunusi.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/pomorebevowivusoteremidez.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_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 11136 bytes
SHA-256: 575ea490a8f289e968deda731d6d8bb0c7e7e6542bdfe2ce3121574808592794
font_01_sfnt_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 16624 bytes
SHA-256: f2be98cc3fbefef6f9c3e5110508f24c0b853f91d53a14176d15fe2a789d474b
font_02_sfnt_off00014509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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