Malicious PDF — malware analysis report

Static analysis result for SHA-256 fceb7ec99e983ebc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 22:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40dc05383863e7b2f45b5fe9319eec4f SHA-1: e6c88452693f6dd8db7e02bf7f2237cf531c989f SHA-256: fceb7ec99e983ebcbface62d8f68b64c770de6d5da35608c0a0d523d2fc28944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links and disposable hosting further supports the malicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=so+either+neither+pdf PDF link annotation
    • https://zapcdn.space/web/img/podborky/files/66988157423.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/elfqov0f4b9ee5up0eoq36hsf0/gizizaliferugu.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/47115062601.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/18669387472.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210719_041856.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/ffd8fb6cb0b0f0956392d7f2752117bc/tixufules.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075900d70609---gonusidosozukogumawo.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd01b506af---waxulenamelagi.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/0dc97d689b4fe9f71234a5a3fe5178f3/gaseloxesutuzenuf.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/70033579216.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/84f97c6ce33f62e42e6a96a46a61624d/13392199110.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54963cf3d---lalofeluzavepumidupaxu.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/razutexalunejep.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/837822042.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf13a0570a---44019655852.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753905e8a17---pukusorukuloleza.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6073b2ed3ac2e3c1227d73f24ea2363c/wizagurumo.pdfIn PDF document text
    • http://sikanderajam.com/Robinson/ckfinder/userfiles/files/xenatelebuxizigimuwumiki.pdfIn PDF document text
    • https://cape-electronics.com/media/file/pelajivijamadolokixarizet.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/62783669234.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f08294f22---95353387301.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/78tqjktd9t6ph9jt4a91pfrrv7/72186031889.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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 18748 bytes
SHA-256: ae4d924e3f777e3a5810948994dd2ecaac809d20e7fbf2dfa3db4e6e1cb04b14
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 10292 bytes
SHA-256: 5d87a1c5dc33a26eda2a4c00e34f3e8b38c3ac9290b8036de524cd964387a219

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