Malicious PDF — malware analysis report

Static analysis result for SHA-256 900c970a285137a2…

MALICIOUS

PDF

96.9 KB Created: 2021-07-30 14:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 284f4125ef28cae15b025356181e4f1f SHA-1: c98ee6cff6871d5fbed823048f982f776da50501 SHA-256: 900c970a285137a2a9077fde4b7bb26141e270f2d51e7a62558bb7fe6750eb0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed here, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://joyear.com/ckfinder/userfiles/files/vemini.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e1be9726---37672751911.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab33f38141---jemusi.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/50188559545.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/36911698228.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e6c0ad57b37bb4acbbcb794fd5bd32d7/4144041078.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89a1609eb---tudube.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/fadokuga.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/folabuvoxuzo.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/90094510040.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/19643635292.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/kotazeguwademotelijorufi.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/31606035549.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/33991954115901d75db2db661ea7f111/saloxebele.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608886e49d80c---61539478047.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ebc12349---57105401052.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/i3jv41po1ta908v9ktgt9155os/wuzuwumiduwadanasevajot.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-22/20210722224755455230.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dvc5isb06eiei45nd4o1oauds6/natavenap.pdfIn PDF document text
    • https://digireg.pl/upload/54261126823.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9210e872db---34817797981.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/88744595056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+music+lesson+victor+wooten+reviewPDF 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_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13079 17148 bytes
SHA-256: e5e26655f772de6c1e5ebb7340b762e923184c81026d64562eb00378f4b11219
font_02_sfnt_off00015d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D15 10548 bytes
SHA-256: 385aa288deb85d8c2d7e16a2a8e924297a2a33b3d93ad5c018b75e23066ab710

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