Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d3ead05ac70945…

MALICIOUS

PDF

111.2 KB Created: 2021-08-15 19:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8d98b7f49447175246a6eb21bb77ac6 SHA-1: 89659b16a742547700263852f256b3a1899ba881 SHA-256: 41d3ead05ac7094573a504e46aca12b319081d3075d4e23a880e83383a76b1ad
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common pretext for social engineering attacks. Numerous URLs pointing to compromised WordPress sites and disposable hosting suggest a link farm designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://cructi.ru/uplcv?utm_term=how+to+download+programs+onto+raspi PDF link annotation
    • https://bepxuyenviet.com/upload/files/sawemesamawivegij.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b14f4ed09---7109199694.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/19bd0ad63f8007112f3c4718d5398c58/68920457261.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c32e84cbbb120de8e0b509bbcfb3e134/kowopos.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/ninuvexoxigajobavozegumom.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/runerufilufusepimuguf.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/vugolugagoxexe.pdfIn PDF document text
    • http://brlairport.com/images/file/jujega.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/lobadaloxixozadasiji.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4c67c89a---bazutebesobozemoro.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/vixifutixowibofabenasajeb.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/99610431468.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5172c1f3b---21751845927.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115332c04333---84486688492.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/14e28f1ef2c8db27f1d1121aaf266523/vadikipibaweseli.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ha5ot8avu0822mv61pdntugvk5/fevutapinadezi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/39d6fa7eec38fd29e765743b8ac27863/72039834345.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/79617255603.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1628959261.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cac137b5---21365275870.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/65801498818.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_off00015081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16893 17176 bytes
SHA-256: 7361fe557eb9f26f626c7973770ecd9bb5f0cdd98b4d3b9a4808c47a20eb8094
font_02_sfnt_off000195bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195BC 10680 bytes
SHA-256: 7711c2b1bb6a64822e05d37bebeb02b40efa3e3501d00ad43915748bbc58f15a

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