Malicious PDF — malware analysis report

Static analysis result for SHA-256 398bb247fcbf1e97…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 01:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14505515209d6b2fb5a3953f8069dc5b SHA-1: 95069fdaa065be049cd6a1018ab9a55c2d9085c3 SHA-256: 398bb247fcbf1e9766457ebedb251f0e634b6b90011b9899db798c6e27dee5d4
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to unknown or potentially compromised domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://superfishinglewood.com/uploads/files/jitupomunevakageme.pdf In PDF document text
    • http://newabel.com/ckfinder/userfiles/files/jilikifikasekusura.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/90244899196.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/91014591712.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/kibujibivagudusoju.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d5eae358---10845645820.pdfIn PDF document text
    • https://masukpt2.com/contents/files/10668270834.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/70992182514.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/71993300760.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210906154938.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/19125732967.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/5160710614.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/38445867110.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/1083434015.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613879b8959e0---kenenomowarabajadojurir.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/nuderitovuragijuzifur.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/pijikujexixedu.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/retasugir.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d4aa46a4be733402a43441d408e3edf/nosuxob.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/varopi.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/fesavezedabaguwe.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/satijaliti.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/1476196307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+block+phone+on+androidPDF 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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 10752 bytes
SHA-256: d78549a257219e427f0bfeddbc82e5912cacb0b6fb86c85b014bd429e88c14b2
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 17768 bytes
SHA-256: 5eda7e9cd995b5d6379b4f7df7ccb2939729c06db8cbe597c2a7cef523e4c75a