Malicious PDF — malware analysis report

Static analysis result for SHA-256 d452c1720818d549…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 23:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a22b453d36a1551f9766f9f4303e839e SHA-1: 364c3b283ea08dd44939364b655f341d7a44f6c7 SHA-256: d452c1720818d549721e48edc70160c11be292e56601762f86e75cb5fe39dc52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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://irlanc.ru/uplcv?utm_term=extended+ascii+chart+pdf PDF link annotation
    • http://chromoink.com/updates/file/71115645711.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/xavuponakepetu.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/94415932174.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3353c30a5---moritegiworiwexi.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/funofojejog.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/73948323694.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161006fabf2c7a---nalixenimabali.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ed015957---61967148213.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/wexikabujaxatizu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4rh8q94l10q52mav9dqnndogu0/30779694039.pdfIn PDF document text
    • http://sdes.in/uploads/nelulitotexalabogezon.pdfIn PDF document text
    • https://united-advertising.net/userfiles/file/sabizi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082beefb95c7---punuzom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611437c0a8937---14052548257.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/kegiwotilugojixe.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/71378297727.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/72a1a71c4c420cf830c02f23f327cdc7/dumadarazinisi.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210808_141227.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/51469468769.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076233ec0e83---2793540462.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/kakalajisefefuliruj.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/1095121491.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 16788 bytes
SHA-256: d6b1e9107cbc57f0f3fb5a85edcf15c667b60fe216a39813e783837d86868300
font_01_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 10636 bytes
SHA-256: 02dc76df5cc56a24f20305ba18873236ed71287afb4072e44f095a105c2a977e
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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