Malicious PDF — malware analysis report

Static analysis result for SHA-256 7990452b371e6f6c…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 22:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7c98584ea42dcc1fff303b5bfc06f3b SHA-1: 1f19c87c7ab3f1e936f1fca6a8d43b73328bcb58 SHA-256: 7990452b371e6f6ca84ab8bb86b2708dc6cf15cd17f200e853a4e510aeb3d8e8
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, potentially leading to further malicious content or phishing sites. The presence of multiple URLs hosted on compromised CMS uploads and disposable hosting further supports a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://audit-advisers.com/userfiles/file/91232065070.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7a44fc8cf9f0c53015243e29a59ee0c3/81861241117.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/vomimuvabasopig.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe114cb7e6---ximexafadodibigumubekotef.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096f4a8d46de---bexobulubitaxaramovefo.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/2301109347.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/d45b3cfb4f8593d9c5773c5269ba1d7d/87791339448.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lu4ekq6dofn79j5dno3b58ukv3/simefasaxarunoliwebomabit.pdfIn PDF document text
    • http://chikatere.com/Upload/files/numorusogabola.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b559f619d5---rusad.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gajoxurebudo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f90506f4536062fd4918a89652bda26a/90075005902.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a85716ea300---19872996299.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dbe0cb3f2---tijikibavopogojufilevob.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7sbd6t0u9rqa62rojglqvelh23/84484680067.pdfIn PDF document text
    • http://tempatpasang.com/contents//files/nukoretiwezenu.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/be0fb084e039367fa23f30b4e645a257/vilimunebupotipafovi.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/nufirazuvurikufitep.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5iktvg8eoboqoh71lkc18bgim0/fudilefugapazazusipaxuw.pdfIn PDF document text
    • http://esejsc.com/upload/files/tilux.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/nenugoligegilitewogupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=history+of+mobile+banking+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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 17648 bytes
SHA-256: be9885cf78c2ce961f2220b5c819ec1750df81352b40ab82bbb3844f21dbc774
font_01_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 11180 bytes
SHA-256: 9aa3b8bfa60eb4ad48749e5afd4f02e3db42787ddeffbba0788198b0e6375d32

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