Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf6550ebd226407…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 14:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27f76d2000c035f7d43324600221db62 SHA-1: 6dde1e327e3b752236985e88df99f1333a3b0626 SHA-256: 3bf6550ebd226407715aac4ab05f7c7147829632a0998c5239bacf7a537e4e1b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to distribute malicious files, with one URL specifically mentioning a game hack. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous external links, including one pointing to a compromised WordPress upload directory, indicates the document's primary purpose is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://irlanc.ru/uplcv?utm_term=my+talking+tom+hack+mod+download PDF link annotation
    • http://balade-pierry.fr/userfiles/file/zipoko.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f41e2cfb57---zijegirazemekevobi.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/73549954946.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/88220515021.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/87247624163.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f0079b80---bikulidigitawakasem.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/38884185730.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/64095271206.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/8182493717.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/16800423213.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd82f5594c---jijifofudirutepifupef.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/rajijadelofamifozosu.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/vepuzapudonesisu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hcb9ueatnerr3td70ahic5poga/39463293554.pdfIn PDF document text
    • https://doitoutdoorz.com/file/Jb8ofxiV3AOqXNn8.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/lasatesifajofefetiwegero.pdfIn PDF document text
    • http://arsvet.ru/img/upload/tujabudeta.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-2/20210902044844106997.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132909c4a9e8---wolatu.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/22965215394.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/48133111153.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/9160660518.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_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 18296 bytes
SHA-256: edd04eb911b3994317c4ae72ffcf20366a111cb026dbf246abecb0e05dfba82d
font_01_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 10700 bytes
SHA-256: 577e7910ea2042ded3de014e11d2bc7056a38f9812ad3deccfd2b3db0c371a72

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