Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f099de53da74bf9…

MALICIOUS

PDF

79.6 KB Created: 2021-07-28 00:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 46383d2f968a82c51ba6b7b66410a0ed SHA-1: 1c8ad77071be844290d2535edde5b1ade9105e21 SHA-256: 8f099de53da74bf97d5983e43dba894eda3e3cb8fd669195bba85cb3014830e5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading users to download further malicious content, and contains lures for fake invoices or payment requests. While no scripts were directly extracted, the presence of numerous embedded URLs, some pointing to compromised CMS uploads, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 8

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eead59c61---bopofuwazagaj.pdf In PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/birejazixobu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9575435979.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/fqa0e57felucbqfb306hggsdk0/69559044086.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b280653e388---7998131469.pdfIn PDF document text
    • http://erdbau-rauch.at/tajekabafawulolijorisogew.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fqmfdvis0v29gl729ksdperg14/wilalid.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/79435823668.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eff78727247---roxerifitas.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd8ee886d---bowefexabuso.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/90f54084beb2c1b6dabafcad435b1ba8/62508802692.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/ribaxuxedevijural.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/lamogazodunovolawudi.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/45980984758.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/15426604325.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/nideraguxawodeted.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4f4cba1046ee29fa544f9b4fe76e8129/82256268.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/kusitozeg.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/61339238325.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/58314216034.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/14923166880.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/zulevitufapoj.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c890476f43d---83849332932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=akshat+jain+mobile+numberPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 10816 bytes
SHA-256: f2ac498cc31569918e6604d84d007948e8d94c901ff406589ad55a06e0ff5a67
font_01_sfnt_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 17908 bytes
SHA-256: 515a7155951fba19bebb54d27b674f04d8b676beaaeaf207f0d0c6170958e56b
font_02_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 1804 bytes
SHA-256: 3081e1d29011b4ced9623a90b3545a4fdc3dae154ce476a399b3535eab64bc43
font_03_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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