Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb43bee0cbb6015…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 15:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28637c863b76fb2226a6797176426841 SHA-1: fb097edda06522c6da0a7300c59af5af0c455c8e SHA-256: 2fb43bee0cbb60157ca9c5f22522550db3246b661b29536392a97a32fabe964e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple URLs hosted on potentially compromised CMS upload storage. These URLs are likely used to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113af2247a92---basuwunemukadimulaxaja.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcc374e4f---16376124252.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/feviwugedufiwinu.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/4q8ingh4u47jib71pskgo6irk8/36386952715.pdfIn PDF document text
    • https://olterus.com/contents//files/61184555628.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kepinuvodaginabezuf.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b3dd4b48---8082997625.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fcd353e2---jipixukogolave.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/47634924132.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd82d2ee1---ravuzirumoxivo.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108101403529298.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/zizisidemovagabixavofafi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/kefotufogizebewuvodu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/b45a69fgdpoonpv1d2eo3dlfl2/firexipiluvivupukojepib.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a41022610---zilusipitad.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/26216038430.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/80540877660.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/pomivozev.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/wolejepigisugogafew.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd082551a---96479359153.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/98266940297.pdfIn PDF document text
    • https://x-software.cz/data/file/xozogatup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=el+derecho+a+la+vida+frente+al+poder+pdfPDF 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_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 10596 bytes
SHA-256: 7986a94227dc125dde6636a872c3a6b648e9491771717384338cf1dc5d2befda
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 19284 bytes
SHA-256: e60738a9dd61b7540a17694e0dcb0b70fa6d783d67bfd41bb9ff7dff37f969c5
font_02_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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