Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2167378dc8e4bbc…

MALICIOUS

PDF

79.0 KB Created: 2021-10-10 12:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 043eeaabf141540871f20ba518453aea SHA-1: 58d63fb2490bc9c43c8e733574f48b89a2c6328c SHA-256: d2167378dc8e4bbc511fc06f6e8687061008dc0ad2f445794eebc12799760526
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it is a link farm pointing to compromised WordPress uploads and disposable hosting, likely for phishing or malware distribution. Crucially, it employs social engineering tactics like ClickFix, instructing the user to copy and paste commands into a shell, which is a common method for executing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://oniceh.ru/uplcv?utm_term=outlook+pdf+previewer PDF link annotation
    • https://aporpeter.ro/userfiles/file/90531359459.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/xaroliwojav.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/nuxosimo.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/96043903977.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/47215178521.pdfIn PDF document text
    • http://gaudi.tw/upload/file/78584484040.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/65068342280.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/rumiwinogakaxibavab.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/36973365624.pdfIn PDF document text
    • https://petikdaun.com/contents/files/46039502294.pdfIn PDF document text
    • https://lyna-garage.lynacarrental.com/htdocs/cljr/data/files/11391687721.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/lenoretekute.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/88775292245.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/jifuwalobidepibelo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe4dd920d---44950133465.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/lolowovo.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/12609239036.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/jalufupiwulezi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7009acae---94780307029.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/sovijizexozof.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/248f85464901b62a556357b10646c56a/81050971985.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/potofibe.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d656a8b17e---46218716174.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/ludirigo.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_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 18620 bytes
SHA-256: 0c2310fee80d862cb7baa9db9bd50fa03984b1f079c54a33827981926d44aef1
font_02_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 10428 bytes
SHA-256: adc4f3611a1eb3ccb22c09be37717c126aa315935ceaa9ea5e62ff792f1fcd69

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