Malicious PDF — malware analysis report

Static analysis result for SHA-256 358837eea59c73b8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 11:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a6ba97de1c1184d19787708c642fe66 SHA-1: 896d70cce6b06f006464b9273915727a45ad7a5d SHA-256: 358837eea59c73b89826f5418206e74f21940cdde0e03debbf4d22d00a516a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=how+to+copy+a+text+message+on+android PDF link annotation
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/93263277647.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/79047039695.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/5871195582.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/31337913626.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/ledowadekafisife.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/goxerafipajivuwobalif.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/lotif.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161429b2d87b97---vematixinisolemobazomo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e22baff3fd43aebff8f05ad98acc36f5/kagemepabopot.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/80968344894.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/35706794444.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d908a5ffeb908eece3924358ee75d44f/fadagod.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/manuruleberut.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/gitelixizi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2l06c5iut5159mqjb863gf0s2v/5046345472.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/savenagopewefazutiwozup.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357dbb0f29d---gifezigewafipinup.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139480547112---laduzumitikiluforuwovin.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/76296842990.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/76739616110.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/45122124267.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/80799253562.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/57803451427.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/fofakesarobutokabibukevix.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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 17788 bytes
SHA-256: 7aace136f342f899c647c6251d48bd0cf40f91d4e8cb04d99dfa982e0f492723
font_02_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 11104 bytes
SHA-256: fb40ee84d06f37606bd6789c85d9ed4dddc4a811e8a12a55c7fc802dc2e7b54e

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