Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b6a909b60f33ca…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 14:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b62225c36bdcb60680bd301903a2b2e9 SHA-1: a3c2b1f925edd7ce3e419ce01c5fa28a9ca86e15 SHA-256: 61b6a909b60f33caab3c5cf5dbf1779caa7b6bdfe1a2bde79f56a4bd520fd519
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and link farms point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b251f6a38876f107be8ee162e2a8ebbd/96691290508.pdf In PDF document text
    • https://led7.ru/file/naxojis.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/nepilagufekaz.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750a28f2f58---33536540353.pdfIn PDF document text
    • https://dptech.vn/uploads/files/filakuberipinamajovurobar.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/fukodalidesalivomaxurub.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/13ebb8ba380e958f24f1f6ee5d4e47e1/62145803387.pdfIn PDF document text
    • https://ambalatender.com/upload/files/86006465509.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f0b84964---12934544529.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/22679397870.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f741eee8a5---xevisupe.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/guxit.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d1c783cd---97697971149.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/146799714ea96226b39c6c0c0e815f80/rufiki.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bf11a5143---fovuvanekeroborebak.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/98987828257.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/78026142992.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/85802216225.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c0c8a6688---43379458508.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/nepulasobuvazezavilefesa.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/lajilinonebilije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=celula+procariota+estructura+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_off0000c23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23D 10640 bytes
SHA-256: 36b7a2d48385c38981274a2e6247cd4c3970ad03234b9426ea6733353da1a47d
font_01_sfnt_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 17072 bytes
SHA-256: c7e7795c5a867d66350e78a5d3f9424c0c193e8beb500d614b49dcd61773dae5

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