Malicious PDF — malware analysis report

Static analysis result for SHA-256 4725ac4904ba35e2…

MALICIOUS

PDF

84.0 KB Created: 2021-07-01 23:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99351d683573d94809d08b99475a39b1 SHA-1: de15a51ebf517cbc8d02fb7ce2fc4d54ef7a430d SHA-256: 4725ac4904ba35e2a44772c4862743362bfd56da55a175193e1460d7a16e33c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many pointing to PDF files hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=how+to+make+potion+of+poison+in+minecraft PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/sexiwebesakotadivowomo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5beaa066---34131792819.pdfIn PDF document text
    • http://lucann.com/Upload/file/38465914638.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/15705735816.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/26444042228.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/207eb1b7f741c7faede703b0b41de0e1/vinudipafemi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609830c9e522c---mapomujufijur.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e424d73dc---83154131539.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/ruzotewufefije.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/luvubedot.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ouahlsjpe8jrap4o5s5voprs96/rifuzi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/acc0b51aa6b4292aa6ce75b3513f27a0/90090943743.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/9460806c7f60bca3105843c1ea1430bb/62817566395.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad669bff9---21026186943.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c4b082c3---20105493310.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/08b71aa7a403b43de77124fc12ddf1ee/nonodakuzu.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/pivagineduxo.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/4893880478.pdfIn PDF document text
    • https://educhina.mn/editor/files/26890559265.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de45c32fa---zatizaguligokekut.pdfIn PDF document text
    • http://egonseetour.com/FileData/ckfinder/files/20210616_2753CEC0D1925E8F.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/9711797593.pdfIn PDF document text
    • http://strandedtattoo.net/file/80954530816.pdfIn PDF document text
    • 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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 10764 bytes
SHA-256: f3288a0e80f46097311b44d050efcfe6fd2c744164a95bb81c083969df773942
font_02_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 16808 bytes
SHA-256: 49af00d0b0c6d3dfd85c64bd22e19b481accebdaf83161910d61864819378ca9

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