Malicious PDF — malware analysis report

Static analysis result for SHA-256 893e75c89e5408ba…

MALICIOUS

PDF

93.6 KB Created: 2021-08-27 19:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ee59033c7d5b4d8f796aa66eb91f865 SHA-1: fcdae9a4609f25698b9394608711c20977dc3035 SHA-256: 893e75c89e5408ba7a00b29c5cac35c6800f385c6c0ade67dd871c08a84dc421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=there+is+no+evidence PDF link annotation
    • https://deltagroup.bg/uploads/file/19997673264.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160861ec8d55a2---pawegabugeguremoxeg.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/besisijexuverujij.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/7850837903.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae6f6b837---3500883987.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/munsn8b2ofm7msg5n0jpo6sft6/28567590633.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/55541263708.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/83bcae7b4c39c2e66e195e8fb4b90125/26517259682.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/kozaxunirekekejojaxuduz.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f4657353---94458170883.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xosunuzipomuforozulax.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/36ffe616356144baa6b563f484bf6687/4555771858.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/13797867271.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/58455682459.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/86033442119.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/9755988235.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hhs02firienih4b924u92k51q3/pajigajiwamijapufet.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9437e16e69---49218436215.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/seburuw.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/virekikorikudu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/a1onep33mful28snpmftdfg2t3/redenufogonitojozewowu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/add634bc3676416744be64617882f608/74937804825.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e252053b0---96855387482.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_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE0 10188 bytes
SHA-256: e9b3161316fefb916621151d184b771706a8eb6aadfbfae0e25e4ea6a7b635dc
font_02_sfnt_off000134a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 19824 bytes
SHA-256: 1b77788eb7bd7525e9e9f378d20980f0942bf127a9400a6a5267230005864ddc

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