Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e93d40256afc060…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 13:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d53f308a0baeeb9f37275fe09c3a12a9 SHA-1: 7fae62a908353dde0ed22adacc9b4bfade7ee93e SHA-256: 8e93d40256afc060209fb6808efaa164206a6ba6d9a247e05041e2e524cd132c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ketchas.ru/uplcv?utm_term=logan%27s+run+book+pdf PDF link annotation
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/25586315266.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/od5bso0i6133k79no6ds9j5rl1/buxitifevosebununo.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/60004873562.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/31834352438.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/32530989982.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/wuvumijefusotetefoda.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070349417090.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/7043573311.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/21094406830.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/wopebarotokusapesarepesi.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210930_171104_3528.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/37939760063.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/daravuwolawanol.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143c59100648---42574781812.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/43871619864.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f6373e5477---94256633775.pdfIn PDF document text
    • https://okul.gencreklamajansi.com/uploads/files/vovibawafofosufimemado.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109080301517635.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/simonepowa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1615697058aa60---jutobij.pdfIn PDF document text
    • https://hirurgija.me/files/778455617.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe2d6eb1d---79672070046.pdfIn PDF document text
    • 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_off0000ae3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC650 14884 bytes
SHA-256: b9c2aa4db1192e741552a30fbb336a7036a1a312f90bde293f34cc001bce68b1
font_02_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 10628 bytes
SHA-256: b2f5a2f9300b4d7dd1a0a29b6fd98643fb59429625c0a924c93bf16188807c41