Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4141e9922dbe25…

MALICIOUS

PDF

91.3 KB Created: 2021-09-04 04:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1775ab1349d1491d6644f4007f3e0a0f SHA-1: 660f4dcca50299ea3036e2b9f83ce794f1961c06 SHA-256: 5f4141e9922dbe2565f82b08e6b7f15bd6fc2621b00e53c925011cce4d5e4808
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to execute commands directly, likely to download and run a second-stage payload. The document body is heavily obfuscated and unreadable, but the presence of numerous external URLs, many hosted on compromised WordPress sites, suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://crewmak.ru/uplcv?utm_term=desinstalar+corel+draw+x8+manualmente PDF link annotation
    • https://samsungdvm.net/upload/ckfinder/files/8450360639.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/l1e8vvqel6qoi7bra6rquftg00/gifipepa.pdfIn PDF document text
    • http://xtra360.net/campannas/file/38230906622.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b020369628---49344043831.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/napado.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5acb079293136ac37c2f77505fafaced/75025043062.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/31921453103.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///61370221168.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/76619431703.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c975f9e1---digesimomuzida.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/48019511624.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/83393981301.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/denudojapalurivu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bf75c4f68---34143739356.pdfIn PDF document text
    • http://teplospectr.ru/images/files/tegumejin.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/12136967569.pdfIn PDF document text
    • https://33mobility.net/uploads/files/34790574763.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/cf46bf4dbe9aec8955e252a212d69181/xaxugojipofezulefijoj.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ee86275871f8ec7df96acf3f7a48458b/rofinexokotenefepum.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/25408408824.pdfIn PDF document text
    • http://kme-kme.cz/files/file/bibowujadumezepasurasum.pdfIn PDF document text
    • http://short-story.ru/upload/file/nokazilitepatitededeli.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/bolasudemenizaj.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_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 11028 bytes
SHA-256: ea5b73581f5ad1626d5d23ca1fb3410da6626aef3b0d58a44f41f3c48e554d11
font_02_sfnt_off000121a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A9 23608 bytes
SHA-256: 1c5c6a3c0e165dccac8f2f89eacd5203c62f8a1294477827f1129e54b410db8a

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