Malicious PDF — malware analysis report

Static analysis result for SHA-256 818c18d872724c05…

MALICIOUS

PDF

106.4 KB Created: 2021-09-07 01:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87e68d03728b3ae152db2cd40c6125f4 SHA-1: bc6e9b43111b16fd1e1c46a5623fed42d2fb8161 SHA-256: 818c18d872724c05594a44b64df216044ab2e6d9d2dc30735ac6339bb9522223
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/u7sllhl4teaicipbkf9u0scrf6/mogejip.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5c1d4eeeb0bbb962dfb36b95284e01c8/35259816955.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/nubilubu.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/zafaximebo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fac893b250a---89660693253.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/19642321585.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gotaludapave.pdfIn PDF document text
    • http://maihome.hu/admin1/file/lokevosotadavuna.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/13436449517.pdfIn PDF document text
    • https://edgecs.com/documents/fivid.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/nikaberisunevuvibape.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/30808910176.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/gepidekipewumovigevumizu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/5e40bfcbd2ada8d8bcd8beb12459fbf4/venojajedojiladomifito.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7bba024df49b4fc7fd3b29d74881e03a/vejalozafepozelurewizub.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ec9a0e9a---dabokabafiwij.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/56190506007.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeec9e4ece---42466592089.pdfIn PDF document text
    • http://dr-temt.ru/images/file/78579183948.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/didopipopibubu.pdfIn PDF document text
    • https://nexapos.com/upload/files/25082399424.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/gewojuw.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/zigikivabidewumolebite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=jurnal+pertumbuhan+dan+perkembangan+anak+usia+dini+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C29 17604 bytes
SHA-256: dc3388128d5fc5bdb8a32f567e79e834df6c471183c5256f0784e1c39f971bbe
font_01_sfnt_off00016a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18226 11148 bytes
SHA-256: 95fed3512261f459c30cde55abf373c24f002162b196b9ecf0cebf1e1c7f25bd

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