Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf97847ec36b094…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 09:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48f41fa89b7028e54d91657d88637847 SHA-1: 02148be8fe8f0aa19677d6c66e9541dfe4e5e021 SHA-256: 5cf97847ec36b094844c88e205d4e31a4a627956a8f7f5ebd889fe1081007adc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://guijek.com/userfiles/file/pukiwetilo.pdf In PDF document text
    • http://studioaeditecne.it/userfiles/file/44787280221.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/89925867937.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-01/images/files/rekegujob.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785f52bda4d---gitipajesanubabemefu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/03798a63ad60cd4165c52fb84089e810/padiniwujilikodokewi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad196efaf---31886950002.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/lidazikapokovinag.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be00b43c1e---tinatebube.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5503a157---rojinakafupi.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/7648582427.pdfIn PDF document text
    • http://altus.pl/userfiles/file/78450378394.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bffe94dcab---49186595355.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/famego.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/62723121559.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/nugawabumilugul.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea43c661c1---bexus.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/demefozawe.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/gasatapomepibogo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c283ace0---33584818308.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/20753369876.pdfIn PDF document text
    • http://domplus.su/userfiles/files/23327127187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=preemptive+sjf+scheduling+example+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 19232 bytes
SHA-256: 6fe3e7b646694b5104a71699924c0a2d65c062d008f18af8bd5a5764e7e47e62
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 11348 bytes
SHA-256: 688956f4d5c83782f1244262a95a27deaacd5b5bde202fa0a5f55841ed58d3b9
font_02_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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