Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2d80c1eb0b0462…

MALICIOUS

PDF

84.3 KB Created: 2021-08-25 04:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 026b82136a4d7fcb1819f88b7f6d6ecb SHA-1: c708e9fd1b14273e42df11d67cceefc240136718 SHA-256: 2c2d80c1eb0b0462e06cb7efc1793a827aaf5e50d4c148c1f5991a95f035deea
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' lure and callback phishing indicators further supports a malicious intent, likely to trick users into downloading malware or engaging in phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ase+609+test+answers PDF link annotation
    • http://sendedianqi.com/upload_fck/file/2021-8-20/20210820104952398320.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210707_477C891E891FF7C6.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5a5424bd4192c385335af490c19f626a/sadovopa.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/40974803670.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/8947336399.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55c5b2476---zepofinub.pdfIn PDF document text
    • http://merwepizza.com/upload/file/towexuloju.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf4c35f1de---39909991706.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/maselakose.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/52175804177.pdfIn PDF document text
    • http://erex.hu/upload/file/44217012995.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210821122423.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a7e64ef95b16fe443e451e9bdf2640a2/33111454595.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/vuvimagug.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/fonarifufinivip.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b16569886d6---xefoxoteke.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/ludukutavadadijotag.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704ebbf3d2c---26153039731.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609617829563b---83339886072.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d604a81c613---12983224354.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/85451093625.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/lorazapusorokipagu.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/73183071034.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_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 17600 bytes
SHA-256: eb427b371edcfacff406a66fb8fb7cde90eb8da413a185c7b069495830598e13
font_01_sfnt_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 10368 bytes
SHA-256: 60301f4c923307821fa5cbecfa6de818ea80613fa3717bd1e28f8f55fb6d59ff

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