Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b50a152f09270a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 01:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40262255ebde878619e72b4049c3dbb8 SHA-1: 15fe76559fa08f384bed4835e89eb632526e3921 SHA-256: 37b50a152f09270a723247d6382ae10585c0872b2ed3d33b147bd37c870e6d82
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 uploads or disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93946565606.pdf In PDF document text
    • http://reylab.com/userfiles/file/xenezawonejikesewenivebed.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ac86a3732380cab4baedfb8af57a8902/23102766072.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8588d7f12dfcdf54bad4ca0a1d64baab/rasuk.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/lovewere.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/91065173165.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7a247f9dec864fc97210c2e25920826b/fusitovuvubagudafob.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/bosukosofisobepumaze.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/lusidu.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///36178520333.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab39239ee---feropakuj.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/nixopejanerupimolaxuji.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/17956649810.pdfIn PDF document text
    • http://iwishop.hu/file/fukogisapaxuwaru.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cb581ad72---58919794980.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/sapirelif.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wabete.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/parunesonolif.pdfIn PDF document text
    • http://deauville.ru/files/file/gulapanurewun.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a0bcc03fe212088a067cc30e4d6f2786/xiromixatuwuga.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/58234649384.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072435895d7e---3340179753.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/55175201929.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/totebamabarid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=lebo+mashile+poems+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_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 10556 bytes
SHA-256: 828e6faac21a8b0cfeac6877c583ab726bf0f26982e4fa6ba48c2872651f59bd
font_02_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 17340 bytes
SHA-256: b41987a49ad23eebe1fa2b220419b5d92d532c73e9eadd2a1d0e7d8c4bc0780c