Malicious PDF — malware analysis report

Static analysis result for SHA-256 a216ef0656d13132…

MALICIOUS

PDF

77.5 KB Created: 2021-09-10 23:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 598c2fc54cd49b9a5fbb7e6b884fcfb9 SHA-1: 31c74edbf46ed5a9b2cf26c4283371eece059611 SHA-256: a216ef0656d13132adf5cc4622449a68b9287c96659b961341cc68d7639d069b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading further malicious content.

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://support-cmu.com/filedata/file/22132986506.pdf In PDF document text
    • https://growyourmoney.in/userfiles/files/titunujabawafu.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/tuvapiwudoriju.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf9004971---97454304.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e1972a6e91375240f3fa584f8920488e/61934772703.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/68209484778.pdfIn PDF document text
    • http://orenprom.com/img/account/file/8140675619.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/75030967743.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/2025949724.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/49827916169.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/jataxejozewer.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/8532809181.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/boripefiromu.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210909165939334874lzn2knlreyvm.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/15563971630.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/85119967172.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/nitodajewijodorovif.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff9deed06---1049913343.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/99356499539.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/gefuwapipejibukotow.pdfIn PDF document text
    • http://precisao.net/files/files/99050691846.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/wafafimazirafekefesuja.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613675aeedd7e---femudafosorotod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=basics+of+technical+analysis+by+john+murphy+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_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 17532 bytes
SHA-256: e475037eca32f0a619c891d12f124b4f3abea6410e54291d932b730fbc27b5dd
font_02_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 11424 bytes
SHA-256: f0c4ff0345722c876249918c8cb495b190c3bf9009292f72889a9d086f7a55a8