Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7090a12bda1420e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 07:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e958835833d6eccbbedca4c5568556b SHA-1: 82901411f0efd6620763ef1d660ea5553c4ca625 SHA-256: d7090a12bda1420eaf2b79bd6536ea50caf380559f6c48558ba7d7b8439396a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with attempts to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=avd+manager+unable+to+locate+adb+flutter PDF link annotation
    • http://begemot-rus.com/uploadfiles/file/2021090613124273499.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109091014534786.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/36688593269.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/vamolotofofomolivi.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210910_092936.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/karoguju.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/noxukakomat.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/zagufunofodelefuwa.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/rujige.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/goritapojugojofo.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/79284473026.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/28336190832.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/11558032550.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d17vss2jiulf9qen47883cji88/jumujileduxuvotasarosura.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///71304864477.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e965f7c437---35617539783.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/wufezabodelitamenakenuke.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/99688730748.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/momel.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/58621089144.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/84074874252.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/79349264077.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/4249988717.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/molipefugezegetozejux.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a975a1bb---11042336926.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_off0000b742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 19372 bytes
SHA-256: c4ea878a332c6660cc0c1080d3292e2677db50b4ff4f9829806043920d94a6da
font_02_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 10848 bytes
SHA-256: 7aaef5bb9679deca431229ffd95f0b1fc4a8a016bf885ebb245ba078cfe2c24f

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