Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6c7deacac3ea78…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 03:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22a17ad7728fb3cd24481bcc1f75e18f SHA-1: 410c72c45bd984eb2584737e72f13382c12be941 SHA-256: 7a6c7deacac3ea78beb56e2ece3a0b85fdadf66135ffc0140bb5449d31edf633
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://packagingandfoodmachinary.com/userfiles/file/46968189618.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48cb36eb01---liwemijobozexomafopepep.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/75587022798.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/93331144375.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210714095544_2146229028.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nikixaxi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716697554ca---siniwegudawefigo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a7f6ab9d60---44105377290.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/lelexakegokizodobuguj.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16114db2af09dc---wasevagu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/gajetanajakazerofebivox.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/12906671580.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ebfd16456---nomufew.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/lufuxadilevozi.pdfIn PDF document text
    • http://bienbao.org/uploads/files/zegekiwobepepoxux.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/libifusigagitowujenot.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ebbed47f3079105a4ddc96d29c6c6ad2/83260725255.pdfIn PDF document text
    • https://qkon.ca/images/file/gomomowuwe.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/f86cc70dd6220f0d3edf0d72326d8850/vinikexujudififomus.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c221913eb65---magewilopawumi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4269c8f037---jetojizetuvawekulu.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/23258250582.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/jiruxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=everybody+wants+to+be+a+cat+piano+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_off0000c30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30C 15168 bytes
SHA-256: e594ebb6ebf2c86932336b84eec0bf9f5798859176c2f95c5fae45fb0172e70f
font_01_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 10956 bytes
SHA-256: 5ba849a38087ead6a96c1ecf2db8f58d69ae9775d634f5ad765afda6434b1525
font_02_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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