Malicious PDF — malware analysis report

Static analysis result for SHA-256 e130984a3a1657bf…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 03:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a24d3fa5183beee308089ef3140f5e21 SHA-1: 54e60877194be6f571e3756559da2a370745872d SHA-256: e130984a3a1657bf7e052a6779b44dacff292c32f29cccc3a61344cf1a34d61e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URI indicators and the overall structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=sync+contact+android PDF link annotation
    • http://vedepcuaem.com/luutru/files/41082500861.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/rixepiruriwuza.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/zudibogikekomakokiminok.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310dcda4854---lulidejokiza.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/565c192ee294607b573ea66e77a51763/guzuvegamezifunifawiva.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/62144104098.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/33344078782.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/25731074323.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aed9883d0---98252693800.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/77055201761.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b37ea0ddd7---30218381828.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/bedutikadilunesik.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/beroteruvajenizokobip.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091819590870554.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/benurefikovaxi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d4df13e2---98034788224.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476238c600c---nakatepebexa.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/66650948363.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/8913390479.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/nusujavipagukomuxev.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/bozudidujev.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/23219410151.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/71673565481.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_off0000c664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 10208 bytes
SHA-256: b6dc756d4f8574d4bc407bf11a3f549547d74f8ba09b68ae62c055076608e90d
font_01_sfnt_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 17228 bytes
SHA-256: 9b1822584459b236e01bb082b11d30396e0da88eeb790ed7b75083ca41e4f461
font_02_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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