Malicious PDF — malware analysis report

Static analysis result for SHA-256 35556d46cb4b01a2…

MALICIOUS

PDF

90.4 KB Created: 2021-07-31 19:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80c27b02a68ffaf6a44d0b98391c7374 SHA-1: 42f8817ebd76b71713d6b8693d8f5cb43d43e624 SHA-256: 35556d46cb4b01a29871b6a3498239bd52bf84c92cdd0cd1c12ee3acb921c043
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest this PDF is part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=hazreti+yusuf+dizisi+t%C3%BCm+b%C3%B6l%C3%BCmleri+indir PDF link annotation
    • https://u-spot.biz/js/ckfinder/userfiles/files/55487288810.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/94584599415.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160739be36c7a2---jivanaf.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d53366c1ba7777dc7cb7b3e28047fe7f/23892383115.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607319eb3e296---gutigowitoxetopapiba.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c532c5832d1---wusapewifele.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/dutuwusudekemitubidis.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/xanosorinavi.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/migaxunanotijelilawo.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/95428456757.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6079f2e9---divezimibobaxoxuj.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c0cabe69580672937ff3869ffd9471f5/68771647096.pdfIn PDF document text
    • https://service-panev.com/userfiles/jukip.pdfIn PDF document text
    • https://wineart.online/userfiles/file/lazeborikipuforapedinupi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094abbf3c68c---93618239401.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xipineselediruweduwapim.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/vopopefowalusabupoloz.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/47532710291.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210718/file/1626623646.pdfIn PDF document text
    • http://thongthien.vn/upload/files/lomexaxutinujuruda.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/ovc0biiu2a5na253uji3os217k/lalipubolubijobudaxa.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/40727025731.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/93276760979.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/guzovonezisemeninen.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b0ab2335b---lapimosixurogemuzuvana.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 11208 bytes
SHA-256: 5f1595a132516fdc025684e91632ff98cbf8f27a5bb1f2484c53b09f767f7ee4
font_02_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 23684 bytes
SHA-256: 639b1a4692bd56f0f2dade683e0d850f0c03c700a78d046caf5bff8f28dd11fa
font_03_sfnt_off000142f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F4 16380 bytes
SHA-256: 677e9695f62afeefa27de66f2ae2c7cbd721294f5310bfc85fc12255cd4c105a

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