Malicious PDF — malware analysis report

Static analysis result for SHA-256 05eb6cc0db583756…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 06:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ecec83e4f078023d090ba7eb75f5ba6 SHA-1: 87f169d48d3099858b5ee63ac8f4e46c830b541c SHA-256: 05eb6cc0db583756ff604cf2b989d03726b9eca8f1d2e207d6bf69fa3d7d6b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://tareeapartment.com/user_img/files/18462288636.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4127be253---42888101378.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/pujenixero.pdfIn PDF document text
    • http://fteq.ru/files/file/72864171441.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/sexupanedujamopujizulaj.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/66301599948.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/91459362798.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/61215259588.pdfIn PDF document text
    • https://adikketiga.com/contents/files/88440659943.pdfIn PDF document text
    • http://labsshop.com/d/files/kafitaparexo.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/41596116820.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c71579dd6f---80955951015.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/81416649041.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/23qmckagscbt8tg1o2f232um93/rugepiwonazavodalerab.pdfIn PDF document text
    • https://mashura.co/userfiles/files/juralokemirufibenapurov.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/69071332249.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/tedipu.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/33852396651.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/lemobagevejanazeg.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54uak32uoul516vvtiudnlsvi6/wubiv.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/37986664777.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/45217716516.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/xitenutubejome.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/tutifofobinirugafovid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=romantic+lip+kiss+shayariPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_01_sfnt_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 10756 bytes
SHA-256: f6af814930c9ecc684f1cdff8373649d5aa7ae5de98f58b7ad6856a372cab503
font_02_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 18408 bytes
SHA-256: de092847d99a6f263e2d3ad76c2d4bc4aec49eb70c4aac896bea2d941ab25c08
font_03_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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