Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e6fd6b8417fe8c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 06:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f66cb06fe03a4bae16c49bbd0084f066 SHA-1: 5c419f488f6449046812368777e1d12bfc7cb514 SHA-256: 95e6fd6b8417fe8c16a9df6499fe1b1162b2255f954c36a74c6753436ecab666
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=commentary+on+the+book+of+micah+pdf PDF link annotation
    • http://bacsionline.net/userfiles/file/10319832961.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/luvosavutoxugejatiratu.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/rokeropobexobilagemeba.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/11677328249.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/23582892097.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/40361477788.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/matuvixid.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/binipomofanuresizuganakak.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/40538459028.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/gudotomiratipug.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109121028545021.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/pukiwutiminolit.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/xujotukonoxezew.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109140003106164.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/xofuxifek.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210901064222409.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/pewufaletatajunex.pdfIn PDF document text
    • https://aaaxxion.info/images/file/86141578986.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/rezilubijefod.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/132e5mpbj80l4099i4g47ai6vo/vemibegaw.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/jamedowafepibobajikeguta.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324e0b14ea1---zesuxava.pdfIn PDF document text
    • https://suksesunited.com/contents/files/wozodazuxaruzoxugizon.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/87372477277.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/72644036996.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ro2siimak0r6dfeh8239tuslru/34021752033.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_off0000c3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 17004 bytes
SHA-256: 24e018486596a3add97256e7503c3001ca3bd4c5fe394b20a3ad444dda2927c9
font_02_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 11048 bytes
SHA-256: e6a7cb8b76a3ff7f24d959f536069da9b149143e504ef1314bad7c17cf67ead7