Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4c4b3584762242…

MALICIOUS

PDF

97.5 KB Created: 2021-08-10 03:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80c7987e1e98f946d6837d586fb79a6f SHA-1: 0169e1dd6db4b36ba68edfef1605e172a56ab2b3 SHA-256: 0a4c4b358476224287386561b366717470e451fdcd25bf0855c4957d0d074f0c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting an attempt to manipulate search engine results or distribute malware through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/73921536101.pdf In PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/misiwamagozatibatabu.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/99618193930.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/tubupin.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/06dc1de732e04febd243f58cd81bbea1/wopivawumudarez.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/guzepiwukekosodowugurelef.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hsqf81bl5b8l3dho4u67jbhqp1/9146837979.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3fkqirpk6r3j5q3130613d1gn3/90970670399.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/49104932680.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/fd1d273f2facff01dc93215d49291fa7/64109531955.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8e3122d4---59314677332.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/diranabelazugifijesiniwim.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/33651368058.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160746be570b29---91394820728.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/tarekexofixugejut.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2df583e5abfb75539d2fb130bc66cb70/modagodafabazemabazuketa.pdfIn PDF document text
    • https://tessuno.com/upload/files/6111aab515f25.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03af19890---25705468762.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/sf8ct5c8dtsvsoujc1oiotb990/95038177094.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/38827320316.pdfIn PDF document text
    • http://yuha.be/_files/file/61577353128.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aq6aglgob9sq06l3ccb79im274/62337115640.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-13/20210513215048777464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+best+refrigerator+french+doorPDF 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_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001309a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309A 17752 bytes
SHA-256: 8a3caa8727533bcac38e540190643019031c80502d63e7c8219e37e255442a73
font_02_sfnt_off00015e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7E 10840 bytes
SHA-256: 506dd43c3466b8d2de2dd50583eefa8f1e5c11ba01364b1bbc90bdff0fcd1f4f

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