Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0896b887797a68…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 00:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35a7f6338fca83cd03884ff9277690ab SHA-1: 2a931d5baa733bc26a14ba7d698dc88f6f3864dd SHA-256: 9d0896b887797a6889153add975e9ed8208e9a4192cf376f3f36a04d9be225a6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://travelsi.ru/ckfinder/userfiles/files/raweg.pdf In PDF document text
    • http://cosyromania.com/media/file/vuvilevizomerixivaloxomo.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/rumivezivobubipovonamo.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/vorunurilinakixaxolinedod.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/3047175473.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/61408568250.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/rujaze.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/kinawimazowit.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/kulakifafirinivupipok.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141733d561e7---rilozez.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/tuzobirogawusekijiber.pdfIn PDF document text
    • https://best-label.com/upload/files/46921819573.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/luwotele.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/ravudevabanaturalunu.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/makojafetokumumanojosib.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/90852163113.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613447601143f---50032499618.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/jefuwalarozojajulisob.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/japib.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/jawapariwiwere.pdfIn PDF document text
    • https://bawauang.com/contents/files/87987597202.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/17414629135.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fefd3cc855---xoxuxek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=among+us+2+online+playPDF 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_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 16508 bytes
SHA-256: 09f45ae5a01da8e93e4cc1455b596e7f2420c05fad0293a635c079798430780a
font_01_sfnt_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 10712 bytes
SHA-256: 23b4c1f222552bdd60516d87c74068d780e67879698afc171736a4ed68abe115
font_02_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1