Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78eab90d3744da7…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 09:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 446a50ad963fc479a1070c2ed7283801 SHA-1: 199daa97226b2948e713fe73689c92bd28efe9ed SHA-256: b78eab90d3744da7ebda5ad8460c80e5f7fe62a0bac418f67dabc85733e1da86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall detection by security tools strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/7d8ba45b4dd3571d473c1383015b3f65/92948237691.pdf In PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/54742314736.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/kabeta.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/38739247200.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/78k4po1o7ffobmmnj7t6c5tqc5/beziwij.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/xukufegukufudex.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/62431689366.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90f77bfe5f---68973840108.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c718816b4ca---60800515561.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/53837824372.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/36125428272.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/kaboweti.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/22514909398.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312e731513---25483844626.pdfIn PDF document text
    • http://i-dron.cz/data/file/29291508371.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7c52503bf8748995f0d2c449d5a5404e/93591264102.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/34419000719.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ac898fdea---95154142807.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/nisogegabenewuxo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612770f7a4165---nalodapez.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/53957886821.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/sijufujezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=data+mining+textbook+pdfPDF 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_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 10860 bytes
SHA-256: 3367e91cdce8b15687053f1e37e3fcd3b48279aa2821e0b5b469ba04c97f0574
font_01_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 17276 bytes
SHA-256: d1dc47c0e884902f94969eff5bc912a072a4d2e73bdc8fca702499d6e436e2a6

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