Malicious PDF — malware analysis report

Static analysis result for SHA-256 8538e72ff65737b6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 00:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 693308638780b44a93ea852f834d252c SHA-1: 730a41c0a8391a3a8a5f610eedb5ed6fb9d585d0 SHA-256: 8538e72ff65737b6fabc7a5b9a813b03e5a0763ce8efacd9af905a00e67e0af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. This suggests a phishing or redirection scheme designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sherwoodonionfestival.com/ckfinder/userfiles/files/49134761161.pdf In PDF document text
    • https://cuatudongsaigon.net/uploads/files/vavejatur.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/xefoduline.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/dojubotekedemikime.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s5g9dm1sh1lugbljt57r24nftn/besajabigugofona.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/fapevozezami.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/15014475423.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/munuwakugiwekuliwijol.pdfIn PDF document text
    • http://susutour.com/userfile/file/34308129093.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/sovakiwavasozoboronuv.pdfIn PDF document text
    • https://clubon.top/uploads/files/35870540974.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/tojegikafirinenonojumenon.pdfIn PDF document text
    • http://nenorm.com/files/files/70307056782.pdfIn PDF document text
    • https://tpk-m.ru/files/file/dojekivedegaw.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/rafetopa.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/susemuvewefonojujobobi.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/bawufoxiribumasazepibe.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xiveduruxuwumana.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/30695587103.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/7449605593.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3b504392---91257075531.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/21502261722.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132f05590bdf---60060900131.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/tepomab.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/zizosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ps+touch+new+version+apk+downloadPDF 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_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 17664 bytes
SHA-256: e8289c1ce2b58896ec0e1b73873e86a75cdcb70fa6a2e1b80ecc5ec7fd717ec4
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 10956 bytes
SHA-256: c450620bfe05032d67b538357631c0b3b6af49991a2526b34b87162cdc9ea567
font_02_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1