Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ab1c7aee47424b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 22:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c95e8a7e24e2686208e8a0fa51724cb1 SHA-1: f42baac96d05ef2f98da88ef8ae0f344f5a6d7a0 SHA-256: 61ab1c7aee47424b85481829711a6228e0a8dfc5023f9306a80f9a8d7215e286
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jjmcp.jp/userfiles/Image/file/bejoferawimojibiv.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160af966e448c4---tewaf.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/kn3dmh8e295p32avrlgefc7igc/22889120725.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/lavurekata.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/bbo98n4a0b13hi71ulf0old3i2/72294679951.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/libuzifowubibabopumosevo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ctpud67svlldv64j3g9erben7q/92422157650.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/87603874662.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/vajebivufarijekixuvu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c469da092---21122214805.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/245726641.pdfIn PDF document text
    • https://micsys.in/userfiles/file/7550659584.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7adeb09fac7f5cf8478836c08de0f53c/kopuvenobuwexelazuwak.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/48617551018.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/53701522149.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074c138881f2---8311395172.pdfIn PDF document text
    • https://renault-service.com/userfiles/26007783388.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/i83vpmd4cunj8toig8v4fq9i57/wozilusatobepidinota.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b54202c35f6---gogogulozexepavitirunope.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/zatafatasuv.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/kimesowoboxejud.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/11110999442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=autocorrelation+function+is+aPDF 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_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 20732 bytes
SHA-256: fd6cf86ca86d58cf60a32da2ea2c8c3bb78ef300312a6924b8e0869ad67a1604
font_01_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 10408 bytes
SHA-256: 9bb610d006590c89c5c1a4a071b53ae49903e4f2ec138e1764619faad129d17d

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