Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6d57d8561d3212…

MALICIOUS

PDF

94.3 KB Created: 2021-07-28 00:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 731f14f213ab70f3b676090e888d604c SHA-1: fb1a9d50dd00cf7a2578458f8fa7624d4e602c2b SHA-256: 7a6d57d8561d321203772ae6ac524ee2bc6c533d67b152bd16d574f8e49b0b13
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains instructions to disable security software, a critical indicator of malicious activity. It also features numerous links to compromised websites, likely serving as a lure to download a secondary payload. The presence of these elements strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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 https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd22634e8---45203479928.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791bd1ed8c5---dowatanasubap.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/gurivogefifuk.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c888d9bd218---laxoxawaguxonot.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4e44bfea8cdbd2aec0e086ebbe529390/58105538919.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/52039138082.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609217cbe3279---dudemamipexu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/50528873662.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a47225bda13---49243541069.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/10207570880.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/6f3a272deaf4ab168566e07bd94373d7/64392021027.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/80289950953.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tuxen.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af81d05900---84874711723.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5fa0abe5---mejip.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9k53vmacfroidcgae9n5fvcmu3/86832149390.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b23a5a7a2---gipigadijatomexa.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa155257f05---sepumelonukubixikiwejip.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35b48a2c4---61627706786.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210628_C76F961398EEDC24.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42df8af6d0---fikuwozugovegonani.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624115608.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/45076330895.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zumewoxafib.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/86693238597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rockstar+games+social+club+download+la+noirePDF 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_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE3 11176 bytes
SHA-256: b6f82a9a9c92c8f9003a9da6e7ffed54a67616e765c4868cddfe2a18f48719e1
font_02_sfnt_off000139e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E7 18196 bytes
SHA-256: 1bced4b94bab6b39f832c9bd740b09394f6e0dfab797125bc66c785086f5dae2

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