Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c1544951c9ab70…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 14:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c76504693007de4dc49b2bdb8a9ce70 SHA-1: cc12603bfd4c779661875f249d02b702c4bb92a6 SHA-256: 03c1544951c9ab703727b40bf9f72a1e1c4cfb0113885e70bb3dac9b8b0fd877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and the nature of the heuristics suggest it's part of a phishing campaign, potentially using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=sun+scout+app+android PDF link annotation
    • https://cordovajewelry.com/images/file/36579623575.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a714cba---wilisibexodejowovugijirit.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/38334938024.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/gilipepuk.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/xaxefatevuxu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a2c0e19e---rerilitexowepesun.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/21967379070.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/deput.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/18059831347.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140219ec9ee0---tonojajafubep.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/tadalogeluwano.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/xerifugagupobemuwutomezu.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/8995756619.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210902021337.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210901221127.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/taduwosikavetite.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/piwadowabeva.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/wifitizubobavilefutik.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032983f5b6---20518038702.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/31467705380.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/mezif.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/55659355439.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b44ae285f9d899c77e8908ca51cafa7f/rikekisaketumuxix.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_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 10504 bytes
SHA-256: da84a7c22e2b6a2c0b3af854c509ab26c3eec3e14bf0fe24380b8a0fcd3a7737
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 16976 bytes
SHA-256: 54350a5d3e1e7b8ed009e23273101de4050c1939d14cd703bf3ab4af1294cb9d

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