Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98227164301f88a…

MALICIOUS

PDF

90.3 KB Created: 2021-07-13 10:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f0be40fe6241aba74fca5fd40ab568b8 SHA-1: 12bcb42dba7f783d536d759c15fb4491e2512870 SHA-256: a98227164301f88ad82b491f5f1ed168ec900d2ecc82a06ec49bfbcb76fb82c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The primary goal appears to be to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://usmleworkout.com/files/file/95504168704.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f97512097---berizigajekaworaledufiz.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210611090900270.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ad51f738---18138149189.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/ripoxasufo.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f0c7c029ef0814d89dc038b6e669a5a5/84768159535.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/85524248157.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9a23b0fddadef19600254adb0f69e972/7202478793.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uh41k1iudu10lhq0vrq0vv53dg/dexegorinenakev.pdfIn PDF document text
    • https://flomogroup.com/upload/files/genenefibimuwixekino.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d49553a0e825431741f9170f9a6178bf/gukototimukotefapot.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kegibi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/20407ab60817ea3bc9524151063b30f2/dejavod.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/bd5aa2e66a3b4095b56b76c8a7812093/90221117814.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ec2db67adcd8f9e763108ec48423486d/29657289981.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/38843570035.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8c6da3c7---42971906754.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6031253e7---fetanesox.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa3b00ca60---70393774972.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34b671a75---fivafed.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/29d82a90c5bf9bc5740c716d834fdc68/wifoluvewilebidosimene.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/revuxetapejakupiteni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=thermal+energy+transfer+that+does+not+require+matter+isPDF 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_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 17264 bytes
SHA-256: f7db4bf8b5579ac8faebeeba1ceb25675d938b14aec2718ef70a51da0ba3c97b
font_01_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14085 11124 bytes
SHA-256: 74c3a2886ad38ad1ddf184dacd47f9ee728ac8967b7bd42ff4070d1398b5820b

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