Malicious PDF — malware analysis report

Static analysis result for SHA-256 184e556ff6f88952…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 12:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d17177d522817ac0633305b13e5f598a SHA-1: 2fd3fb015f99547512a81cee9c89374d51d7abd3 SHA-256: 184e556ff6f88952bee97af3c3fe60ef01016e9ae044e2112a39b951d4ccf361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the structure and embedded URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://faradtvandor.hu/picture/userfiles/file/18090744710.pdf In PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/993087864.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/95650344561.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a964c9e29---nitawelofevolivoneran.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/defogafosivogepuxaga.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/19c90277475c014c9d4350e94213dc61/nezezunamivatugawab.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd97eee12---46721554986.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/69907973769.pdfIn PDF document text
    • http://datcat.vn/2018/file/92013410474.pdfIn PDF document text
    • https://digiconelectronics.com/media/kavogagijetokanidofov.pdfIn PDF document text
    • http://capital96.com/userfiles/file/majufevogagejirilanig.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/97700645905.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161408ff91fd7f---malusakimijizixu.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-07-59-40-42.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/51944594278.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/rimasibuwidaxefatejitij.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/52407727472.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/serefutavumasiramowi.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dekimewulatesexu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0755d01a868c36998808f29ecb987706/lemanag.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/rawepagupage.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/33507873448.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/62978904735.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/83375084960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=harry+potter+1+watch+onlinePDF 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_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 10544 bytes
SHA-256: a984b0f248d398d39322608abb661790705daa47cb2bb3013281ec4d63b7d2b3
font_01_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 18988 bytes
SHA-256: 6a26fc1ea0920208c16d104903f9a8f6f6b0ac13ee360ed548bca2584fb3fafa
font_02_sfnt_off000130a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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