Malicious PDF — malware analysis report

Static analysis result for SHA-256 2214b8b914686917…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 21:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6f0af03ec000c0b7af4cdc897cdc817d SHA-1: fbd6d9553f1a63192eece1110024ca8806d8ff51 SHA-256: 2214b8b9146869172907cd0f9576506c4e57adec0b5a9b0467eb3ba066dd0ae3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chiangmai-clean.com/user_img/files/riveguvivinazogovakozu.pdf In PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/51192735946.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/52296842274.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/50530787790.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/porelowonubaboz.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210909045918.pdfIn PDF document text
    • http://12shio5.com/contents/files/fewasul.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lalezakaredoxugavegazaj.pdfIn PDF document text
    • https://btegypt.com/file/21248693133.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/98503652915.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ab3c4293ae0ca8a1308c0ce204319ff3/23977716406.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/68937255928.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/30712436800.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5f6ceb30---jilanavexefazi.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/60560455380.pdfIn PDF document text
    • https://managedentalclinic.com/ckfinder/userfiles/files/wokegu.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/58938290472.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/gezusunologamajuzibeferif.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/detoxalixiv.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/geguj.pdfIn PDF document text
    • http://mdtrend.hu/files/file/mofalavilatoditor.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/31980171349.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/20137184351.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/de2d59c71be1c87dd4faafa06ca792c4/nolofovo.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/nivapepodilupos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cartoon+gun+gamesPDF 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_off0000b28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 14776 bytes
SHA-256: 95a24d7d1b340968434357df49a3a83241d07e205ade2554b5833454626eed35
font_02_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10444 bytes
SHA-256: e67570e063f6667651404872e208e2b948a8b4f75e05af8187f705afadaa8f93