Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb50b8d1d08e393…

MALICIOUS

PDF

115.4 KB Created: 2021-08-08 01:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4df23428a411ae0ba979df30d2135557 SHA-1: 9eab54cee5b3a7de6b06571dcb94a7771b3ea980 SHA-256: fdb50b8d1d08e393b787ea77219d1061dbea1a64d67c4ebc0920d220325a9201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609448f28ce2e---lexegisejovokebadar.pdf In PDF document text
    • http://chandravanshi.com/userfiles/file/28684773143.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/29361286814.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/e89595pmch5ki2est81ljpg2fu/81099197470.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/3226b583765306ce30d7f57832fc466b/xamugefu.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/54959645047.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a61c16def---wikiroxin.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c3cd1fcc727d3e55c02bdc2c9ec94b94/51044381955.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/25197911136.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/pavexulazudarimatukeme.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b331655c2ef---jamupalasonelipozobupivov.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ql19h3c1ac326h2hcmjlrjott7/37378884866.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vtbr9klfq5t8rpc7bl2e4a1cv5/pawetar.pdfIn PDF document text
    • http://chpcentre.com/files/file/lokokusataboziba.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/22657359292.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/79409186622.pdfIn PDF document text
    • http://goldmustang.com/files/files/22848893016.pdfIn PDF document text
    • https://tepihtrava.rs//files/dutarawowopifa.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/6a9b17c8cff06c3b3b00908729bda6ed/rasozomelenuwogikiwan.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/raradiwoxuxurifudaw.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737ec89c93d---pizogoxelivuxowejiwek.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb2b3a41e---mezevuluzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=quinta+sinfon%C3%ADa+de+beethoven+partitura+pianoPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8aed070537afc43dd4e4261c39c091cd/48711397770.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_off00015afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001730d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1730D 18528 bytes
SHA-256: 6a1bb5fb14466efae41026df717c7fa30d287eb5e9291397e83001733eab64ae
font_02_sfnt_off0001a311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A311 10976 bytes
SHA-256: e6f6ec435a4c8c3555d5c560c42523ce8111956a89bae0ec6fc8d3109e15fa95