Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2b93a8c80c2f5d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 12:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ad20b43eb6bf833954310c2915eaf78 SHA-1: 8bfcb153cb8b9c1b0ba69b72b703e13365fc05c3 SHA-256: 1c2b93a8c80c2f5d3d21aaabc0bb281964dd0c719d3871a8b5f0f2d9b9aeab86
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF detected by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt, potentially leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=gta+v+mod+pack+for+gta+sa+android PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bac8864eb---pobetaxovelifuzowademaze.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/37356615963.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/sogozulovimukezipasuf.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161409a217ccf9---33070675825.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/fiboremowubegamewo.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/81638802555.pdfIn PDF document text
    • http://orthodoxnews.us/file/rejizobikeju.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/64647095552.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/12626035614.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332e0a1015f---mesuma.pdfIn PDF document text
    • https://plasy.com/uploads/file/30496598625.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/17170108481.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/97386900249.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/dujefidowij.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/povabode.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/78410081266.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/laturojemitokuw.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/lunugutofafafo.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/kozudek.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/navawefipot.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/zodasikebomosixu.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_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 21196 bytes
SHA-256: dd3d3b3afa39877f6e81d2cb53e98f614b9af65389501f36617e94fa93fe08f2
font_01_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 10984 bytes
SHA-256: 6ef809653f6ee75ac02f3da9fd48b409d4c51fc1985613f902a6c0afa0d7f9e1

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