Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30f5f4c462ed612…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 10:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ff75f1ee26b1281d62c2a3f05059ef7 SHA-1: 6c809cfe84adabb4946efeab2e8af54e48e5ca04 SHA-256: e30f5f4c462ed61202d8d11dac69995324b02584c91b0cbbd8c4205bb48a0db9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rockhousemethod.com/ckfinder/userfiles/files/84284586005.pdf In PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/1850523630.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1g06b5kfqq8qr9qi54d04ld1d5/75390719234.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/80787990984.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/99146150046.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/8023175479.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/98363678252.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/99620742494.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/pobogoxefuturojiwidexagif.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uhhkqqn29no44g3jmct1c6oi9i/35684343699.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/he9ld95cjmvd4jrgj58bh1khrm/20653823450.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/8903245527.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/vawavumoxodidomow.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/masawenukodezo.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/tujikimixosexogoki.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/91458502930.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/54224151198.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/nopozi.pdfIn PDF document text
    • http://ducthai.vn/userfiles/file/kuwezazunerufomoxokiwurit.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/muvizetolivuvuzama.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/62059998429.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/35304499502.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139391467aaa---86436868840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=autocad+android+full+freePDF 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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 18104 bytes
SHA-256: 32aa71726e7df2ee3f49084c798603c45dfb92af42264c0a01aadfb04440d487
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 10380 bytes
SHA-256: 6699c12f9a07993c9e0d7afd4d6c9071108f3c62b5db78b292b5a2316621617c