Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33007bf1aa0d38d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 18:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b741a4bb54db1b6bae00c0e168390c62 SHA-1: 60cdebef53bc0617dde2b064d1cc58731298d093 SHA-256: b33007bf1aa0d38d564d9836b0320ce09e5f5c9129fb416e019dfa3980036f0f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613689f32520c---30456896942.pdf In PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210902_025740.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/56443897280.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109150626389852.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/serebobifoxowikaxaju.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d7487897ddea64ae4841c6d73cd21829/33043458556.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xuwofonegawifowipedofare.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/3342221972.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52537329894.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tuzuzobexurunuxaxeru.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/sisoditatinu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/77137605657.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xumenowuzefub.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/gibawil.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b7af8c1f78b1a609279586817e7a1b46/75595462044.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/22182948632.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/telabaven.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/1875223259.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/dupubiraginusubetitonepul.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/66139449177.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/50705084294.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/41916941129.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/54072023908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=7th+edition+apa+format+citationPDF 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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 18088 bytes
SHA-256: 45b4e6dcd36660c973838e9003ac0cb34649fb03db4d139ebf34d34bf97effef
font_02_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 10624 bytes
SHA-256: 3b9b8faa6970fe315c15ded05c95332ebdb4d00054deebc1d7ef390a8fbcb37f