Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c9c99b0787fe85…

MALICIOUS

PDF

89.5 KB Created: 2021-08-31 21:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 5bf3651f1b905907395b30e29d29a326 SHA-1: 7510b8fc1fa67e82b83d6e76d97aa561bb90fa65 SHA-256: 23c9c99b0787fe85dbf3f04e0d9e7b8fae528741ca1390b42b916b36e29f25ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=introverted+meaning+in+tagalog PDF link annotation
    • https://travelstore.tn/userfiles/file/92364893241.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a5ece2ab---84119266327.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41604217509.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6d35ee31e---69388150292.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160997aa7bcdc1---17978538740.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/28476201546.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/90781249386.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/42679405253.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/fanemikufelopogaz.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/2408560890.pdfIn PDF document text
    • http://parfumland.sk/upl/62383109719.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-30/20210730022519314419.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aaf29d126---96063194321.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/65842181573.pdfIn PDF document text
    • http://cocoal.com/uploads/file/zusokawenosix.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ko29a2v0e7l6up57aju4o6t68/33941210857.pdfIn PDF document text
    • https://ms02bet.net/contents//files/87835328086.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nakopenenidixijorokaki.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/if85m2j5rjb2iqpau2j5h7s6qn/41265716016.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a32acbe31---82100009858.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14650f32eb---59741854353.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4f559594d46e381cf47bac43198ac084/73158602665.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_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 10440 bytes
SHA-256: 00ca7cdc60d6c9552683d07e37ec8f5e4a3fb116bab9fc1acc2e849d5fb2fae5
font_01_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 21048 bytes
SHA-256: 4269b8556d3a7584748442028bbd3f9a9ac4fb7cc768d129eb298b57c1371d93
font_02_sfnt_off00013fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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