Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a3a477d46f2a53…

MALICIOUS

PDF

73.3 KB Created: 2021-07-03 22:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 441e69d0a7a4f9154e8e605f9eaf16d1 SHA-1: ed5aab22e8924a6bf8ad42551f9b0f057ee98402 SHA-256: 27a3a477d46f2a5335c302e226ead53ec985ec30f9a14d9552385f8388b36f4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. The embedded URLs suggest an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/309bc05f17741a4a4e7bdb5b6d9d7e44/97739456462.pdf In PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/muguvurepuxoserukoziwiva.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/likabe.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/putisiba.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/rasupomekarevubez.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/475d29c6f2fb8ff321771fd8b0b34741/71571095459.pdfIn PDF document text
    • http://mousike.it/img_ins/files/61594004181.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/49667581722.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160770a8c926c9---66174038153.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/nopuvufudaf.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f82d954c---dafosutebaxavobizuta.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/mg2unso6ed9vqmqve0osg0fdbg/2911597425.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccfc6a4707---nemagugubodesegeloxodo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3240ce30d---velimujiweker.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/dukef.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/25557043501.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5ce96469e---32119136707.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083bee06d4e0---sizareketizodoturuwawi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607909b4b245c---94890837643.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kigaxanu.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/xewesuzosefizazi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ee59cb05---77374882717.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/9e0300c2e3b3d891c85c79dcd3c38813/sajevudozaraj.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733b2472587---tosadelusababitunoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=abstract+and+concrete+conceptsPDF 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_off0000bed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED4 15980 bytes
SHA-256: 94f2512fd0ade8b32042886337ca69d1f248edc9051b7f28eac7551a564cd31b
font_01_sfnt_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 10492 bytes
SHA-256: 5aa24ade62842e4e2fd0ffacb2bb34f11c42bd96a740d063830da84f3a7cf7f6

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