Malicious PDF — malware analysis report

Static analysis result for SHA-256 79885e5f41f15bad…

MALICIOUS

PDF

86.2 KB Created: 2021-07-20 17:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83b13da5c39b3fb29b19fdce5b2a4d29 SHA-1: d897d4b1ed25f9a577ac023337630d1eb56707fe SHA-256: 79885e5f41f15bad6e4e19e0f55a5e38e4a6ca3c59b48a6ee204340561f80740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://abhimaninteriors.com/ckfinder/userfiles/files/31825438755.pdf In PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/laxizofefepugefesalikerem.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/75784563314.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409825004c---bovilufovoxisaliwumef.pdfIn PDF document text
    • http://sun-tes.ru/files/file/fizigariwavikow.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/xibajosepisujavajifefuz.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/3a678e31fac422fa9e711d23ccae4ec8/juwotil.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/wizimejataruvedativuvutix.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/wezisos.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8cba4d23b---zenazovakifer.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q90e080a8aqqj5mvgak954o2c6/xitadipixeponomu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160831ae00f78a---xewupofamuke.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1079ca9c6d---27479053080.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d27c6209---kisotusetisuxamofomop.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608457197a75e---mizaki.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ddb997d2---99367678152.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/u0cu338e4ieros5oe0u140s7p7/954902869.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tixexafusuwaxizuk.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/dabapetibefolelubozopije.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/wajaworovuda.pdfIn PDF document text
    • https://ptogel2.com/contents//files/jupofogekagulimivogo.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/sexosudife.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b6f45b482419567eaf9e8c0d3ececbbf/27787673380.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/sifulolezepelosupab.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/48c00a22ccf9209068c4ee916885439a/21816676356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=itin+number+for+spousePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8635c6d0b8ba387de20913589487a9e3/50464782014.pdfIn PDF document text
    • 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_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 10500 bytes
SHA-256: 7d402835e648bab1a8f6d2c6615a7515c200a8fb1da34bbbd6570abaf4f891a0
font_02_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 17244 bytes
SHA-256: 269816fc3f1c124b2cf59202f8cb88c9ad0a56cdf6fe60c176d48780665e3b1c

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