Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1ebe41d51c4d99…

MALICIOUS

PDF

100.2 KB Created: 2021-07-15 20:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 97500b7b963be9f8299340c77ea34da6 SHA-1: 0d585054f6bbd99ddb11f938443e343af220509d SHA-256: 4f1ebe41d51c4d996cbd918d32dfc3d695d7a2bf9a5fa9e611910091c60c8731
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicate a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.romanschatztruhe.de/img/files/56801392413.pdf In PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6c8524548b31444fcd6a124afb28befb/rugug.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/mabebipexalemoxiruki.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608165fa7f535---5425787929.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4b1913d98ba69a486eeabe650d17eac8/sutomedewedabizer.pdfIn PDF document text
    • https://webmenuplus.com/images/file/74512296682.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e248a871d07---marejifegifobixiwi.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/18738409269.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c687bd80d2---gubiki.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/0a22d87714dca61e1decf8e91bf0a4ca/dabet.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/losilumubomonobewerova.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eabc9d879---nenuzedinugafema.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1p2iblv0i7qccasaba09gi3pkc/11694552637.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/56990054428.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070f2111aa23---vabojosotujuzik.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f7dbe75f86604811be15b13811946ecc/75679467072.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e053f929541---70859766908.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/080v7i4fjicubni6f594807pks/dapenilomivaremuxabunoke.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ca122ec7---lunefixetodafi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021053102525376.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/31616261272.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/55577924022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+inner+lining+of+the+uterus+is+called+thePDF link annotation
    • 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_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 10820 bytes
SHA-256: 15838e86c686b7ca8e6522e3f160b9afc60133f005a21df1d9bf1121022846fc
font_01_sfnt_off00013b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 18476 bytes
SHA-256: 177b93fb673c19771f1bce3f0643318f541657a3159fc44bfd31a29e12f48798
font_02_sfnt_off00016b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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