Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f48ab4cfd52d088…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 07:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f829bfd1e1c63632072c7c1aa6c5ba12 SHA-1: 42b6fd11b43d398beb312aafeb95361e060b5974 SHA-256: 6f48ab4cfd52d088997629690705200c57ca4c9cecc6d09d80cc3dba8a264474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack pattern observed is the use of a malicious document as an attachment in a phishing campaign.

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://amkchem.com/upload/files/89423248434.pdf In PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/wefamabegukivudilawi.pdfIn PDF document text
    • http://gespk.com/userfiles/file/41465090277.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/62529746825.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/91012479001.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/c7t6o06v02r6agct37km2held0/26527268156.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/67822272411.pdfIn PDF document text
    • http://etkenkalip.com/files/rodawezidelelo.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/37933359921.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff76be80e5---ginujurujunuxiwaroti.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/ruputazegegeram.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/fopitujunujaxelomu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8efa0388d79fe5b168aecb897d27cda9/ruzabobarelaxe.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/kixevosesumotobobalov.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/53220114435.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/visulusalujiwokop.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/23243779976.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1540bed4d72d618013373fbd5de896e8/57253228401.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109020102046935.pdfIn PDF document text
    • http://ipublicity.cz/data/file/14115022376.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/35915774035.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/fazud.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/6717085278.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/61366098104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=orient+led+falcon+32+inch+price+in+pakistanPDF 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_off0000d27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 11128 bytes
SHA-256: 849d12166aabfee83d7ae18936633e4a83e0c5db9633b16d88ef12f901275d04
font_01_sfnt_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 19572 bytes
SHA-256: 62f007ed1ef7b5758d9420962ef4e0c274202fbc3f9d79b47e5e437937f4f51b
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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