Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d499480aeff3c2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 00:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee3a920f88b21f87976f5dc99ff50b40 SHA-1: a5964192c3003b605c578b5c708d858f0ad73b2f SHA-256: 19d499480aeff3c2d4279ecb6a072e6abc9b3df3450893dfdae1679cb3e457b1
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. The primary purpose appears to be redirecting users to external, potentially malicious sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6ce519f2---kikalefofamip.pdf In PDF document text
    • http://birizgardenhotel.com/userfiles/file/70840304781.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/50019441794.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108c99659df7---tovejaxeliroture.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c10b925e3---burugixiti.pdfIn PDF document text
    • http://juentai.com/userfiles/files/39980199230.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/57057006593.pdfIn PDF document text
    • http://mlight.cz/archiv/file/ladijapefazidawuvojed.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e8f2487b5---niguvixexabawijonugipu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad6774e98---tokamatilikelij.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5eb76b219b00c641f1b1b77edf593ed/jeradibapa.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/96772108734.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/ad938a0209aa56a770acb0c224ac3cf5/nitivol.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/urdisriteh9f8vcb8dtr17a7mg/6608439113.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/83608536874.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/damolojizigipisinan.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba9d0ad25c---sowakixebudatojijapigalo.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/31947521048.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/64100931741.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4tbcu49ttvgqg9hc1hktintps6/25671965077.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785541772dd---27470502010.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/posemuxosirereriselexoj.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e53d91074---zebeselivetubawut.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/cda2889eeb1a8c9b08335c9242867563/84334887293.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8b254aea3c8dc64fc69030b533817d34/jonazogojikoduwutokelov.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/wirukib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=filelinked+download+for+android+boxPDF 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_off0000bf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF70 10480 bytes
SHA-256: 0b691866b8d1f8e9f20543cc69e3f84dd169233131c645cdfa09dfe1ef643a64
font_01_sfnt_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 14204 bytes
SHA-256: c3ae90c99544035b5a11311e30cc55493becaa905df61971dfdd0c63f17f5add
font_02_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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