Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d94eae47f965bb3…

MALICIOUS

PDF

87.4 KB Created: 2021-07-21 11:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 23a2e4c77ebb7dc83f4c43dc05142903 SHA-1: 7d3785b87b6a01df5dc4c6a924ba77d50269d17a SHA-256: 5d94eae47f965bb34936706854209bed496acb065a8122b8a0e0f77aca2b0680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nova-auto.com/upload/kapalovebibaz.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d72118bb---93678623092.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210718_4B4248DF389EBF1B.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/rinadofukaxobokuxiwabew.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/46671966303.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d7b3841fc8fe292c81a4434250caa181/37463888210.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99ef57350---19442454948.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/widamokovaponerujunaxe.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/58929000373.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/q48ek7v96ofpg3hts3t4a9ppib/sijovina.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/wijanelujazazisos.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6c2f1c1d---xarikofunawadibozolapopu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abd766c78a8---widoponevadub.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/voxibumajogomedafusoxinoz.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/ladewodemafoxawajivi.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/9540835780.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/53419480240.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad4fc14ae6---napabezonaxusuzemipofaxi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/47066068354.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///musev.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81dd98e213---85387245039.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/napejelovagijemir.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/disetulovonuz.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/fae9dcd4da8822f1f48de07201e90118/nolurinoxa.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/90362931868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+clean+thermal+paste+cpuPDF 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_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 10724 bytes
SHA-256: 91517fe10968f5617b3ca6eb5aaf4a8a5f0461270868ab96895a767982e12ad8
font_01_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 17612 bytes
SHA-256: 5e882fb07baa2fbeb3a02321c25d590ffbb750619da7809c23042f4e9dd8cc57