Malicious PDF — malware analysis report

Static analysis result for SHA-256 0632a192a79fa86b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 02:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7699fed35d0a566a74a12854cf3fb7f SHA-1: 15fbbf51a6fbf4e3196a0e959c1e39d308634d25 SHA-256: 0632a192a79fa86b40c7e249ca8a480d4fa04800af03e5fafbace1dd9fded1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://investkwik.com/userfiles/file/zifopogelimubinajajok.pdf In PDF document text
    • http://skulpt.in/admin/uploads/file/37304217426.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad6e7f2ce---rutijoremes.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/munamukoxujorerenedobu.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/ratezupotoxuwijetut.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/sepufak.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/77060520851.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210902033031.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/25286656546.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/34136567382.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/18913372046.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/birafedojulegefoxarewoja.pdfIn PDF document text
    • https://msvadba.ru/files/file/pawabo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/df71e6b4be8bcc2ddfe52faf03ebbf2a/6666815407.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/6118869447.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/21357317239.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/roxipatebivuxiruburebug.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/genurefaku.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/baseduxabegoxenufisadem.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613548e2d9f1d---kadoxigawasiwomifiwab.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/27412488191.pdfIn PDF document text
    • https://businesslife.com/content/files/45145284573.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/14415781853.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32d3309c20a8834cab102b338d18e909/vokeraxulefokivejumobamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+clear+the+cache+on+my+phonePDF link annotation
    • 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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 17932 bytes
SHA-256: 2e1966d4705f467dd2bca46be474cd142e964aa02d7b0dc91eb35d262548eddf
font_01_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 10804 bytes
SHA-256: bd57334c80b38e86ecfb93e699d26989a513f30002000b301810a8ff76c5e8a7
font_02_sfnt_off00012bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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