Malicious PDF — malware analysis report

Static analysis result for SHA-256 619c5b442cf50045…

MALICIOUS

PDF

84.5 KB Created: 2021-07-07 17:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 249259210ce14c38dc8239537dcb87b3 SHA-1: 5f37d0e7d9cfb60acabfe2c05e677ff918c230f1 SHA-256: 619c5b442cf50045f62ff41b8a508bf6301b2b10f089dfef75bc1eb8c3cf1d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=free+uc+and+elite+royal+pass PDF link annotation
    • https://ienter.bg/files/bamizopaxabowojowaki.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0752d857a---zuvetinonumasono.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/ruxivu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b818c160---numipew.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd5eaf1f9---64038746541.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/23075386777.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/39275028857.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210530_3F2D195B09A7B199.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/rakurebapinuzenuvit.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jfmcsqf0ka8b37011rqgnfj8ol/83776707966.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608833e3157bf---99912030704.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mmrddatcpvhk6sue8smcc8orir/zojigagawafepobimafajagak.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ufufegikume.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5de39b7a46---pisudixi.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/b422fa52345828fc8cf8603abaad633a/vetijijedigepusivi.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/36950801284.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/4qvjftcksluf4l4v60qsakvig0/89595973827.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e498059927b---70508004749.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e73122545571d34a4d9c88c66979146f/darok.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/xifipebeg.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7233128e59783dcd17b18db23495d609/vopezanikomeragak.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e5c5a14b6---revupil.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_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 17408 bytes
SHA-256: f761fbf7a9557b76d12472fac41bb2cb413288efe038a9d8718867a19e27b0b1
font_02_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 10696 bytes
SHA-256: 8a2e6fcb122f10a520cf28ade66a8b943c32dd7acd451b77a10a11a334a9f2fd

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