Malicious PDF — malware analysis report

Static analysis result for SHA-256 523af125f648a398…

MALICIOUS

PDF

83.3 KB Created: 2021-08-24 23:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fef5ba4810e817936e295f9c33cbe3dc SHA-1: 0f8fb2984a52732ddd0ca53678091db60aa15f5c SHA-256: 523af125f648a39823db6279aa33d7364176cc5b58d4cb202e6c5adbc8b36800
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to trick users into initiating contact with threat actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=word+font+styles PDF link annotation
    • https://srmhomes.com/images/bulk_images/files/54882306034.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/88005725332.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210822125631.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161127982869bc---vanikibum.pdfIn PDF document text
    • https://efnnma.org/files/file/64423242606.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a06923266b54004d86e05d751104f8d/kadulija.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/voketazumubaf.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/fuzivazopusegitirozami.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6633bdc66e---kureritetasotagivipaxizit.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075b42807864---fawureje.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sng2ast0fc88jk95sfpvfsspg5/8177719876.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/womak.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf31245fa6---nenuv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab23db4189a---volukol.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/gugoga.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4updbnim4uq8ucj7p4ebrr3cqg/9806717089.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/befigevedupefojoripo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d767589ccac---jifedewiju.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4deebcae52---xudupijot.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/89175262855.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/87820620628.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d24c56101c37c5f0524d86c1193ae4ac/xowujitulesizadugajedo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c9b72358080dae6ade6a0471bc7e1bf5/46219810610.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/6454925265.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/kubimenezamiwam.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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 17868 bytes
SHA-256: 6f0705d964e9cae2952ae23fa7d1ff7fcaa6d267774f639e39863243ba2d2812
font_01_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 10200 bytes
SHA-256: 57bf70f48eaabb4a4d682adf8965b399a9efab053510f2c8afaa89ca5dc2c37f
font_02_sfnt_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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