Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7c391b8b1235e0…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 12:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2129f46cf1816e1cd8b00e97825aeb0d SHA-1: 480e3fc79b147387959b26671367fdc6166efca3 SHA-256: 7c7c391b8b1235e0c6cea71826eec015b71448ccef7d3df8b71a4304a1fe2231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://ketchas.ru/uplcv?utm_term=osteoporosis+tratamiento+pdf PDF link annotation
    • http://www.primariasantana.ro/uploads/file/20354168404.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/bojeserot.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/borewipuzikinumobe.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/dasanizidusizutidozukope.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9b985a0c30f88d88b6e9befe5552cf07/fisudop.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/5029068908.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa837c0c4---88327963233.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/utjfc2qp5d9rbgkm9r3fh4nc98/84729186184.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/98901301509.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rq0feincnq3g0mc5rt1di5vaq/vavazukijalege.pdfIn PDF document text
    • https://laps.pl/userfiles/file/97269011185.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/25230560403.pdfIn PDF document text
    • http://pneusmarene.it/images/file/megegozukovezonor.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/bizoribabiwiwotebut.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac269d7e5c0---32785095176.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9nhg6j9ildcqiv9etmmsc8o6ov/xobizajuzisixogivipoxofaz.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a175315b1046a9c97f7de9576d48a5d6/3800789938.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a28bf0b630e01def37b3c58156191130/28306746416.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/tawozitenidakidotafofekal.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/pabemulefiker.pdfIn PDF document text
    • https://2acontractor.it/images/file/kajife.pdfIn PDF document text
    • http://afslab.asia/upload/files/waxorali.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/lanevab.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a1a79243---77732843062.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/43b080e057c3bf3d6bf9a32018c080b8/madozenizopurilopup.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/94611214699.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ea52e9a7f25962bad76e047d19ff074f/65164928149.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_off0000ccf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 10636 bytes
SHA-256: baad06fc4546584c303d02dc58b8719ce84426cc6a3552d08d68bf4463a8f2d4
font_02_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 16604 bytes
SHA-256: 4878a5b5f0afc08843313b4b8931837956c8811bfec62f7ca54c26d30d03090c

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