Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01ef42c68af506e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 20:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3e10cdf4ba69de635937fc4b72bce04 SHA-1: 9dd377f908512aabde38f0484f9af613da1d3ccd SHA-256: f01ef42c68af506e208c918c05bb2d6df295a713c811002716cad1cb80cb3c01
96 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external websites. Several of these links point to compromised WordPress upload storage, indicating a potential attempt to distribute malicious content or manipulate search engine rankings. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://associazionebriciole.it/public/file/karonovumekevi.pdf In PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/92527208491.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/nevukifinelutefas.pdfIn PDF document text
    • http://446888.top/userfiles/file/14230062001.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/70437094774.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f67bef755---97427112688.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/33659f31f7f4d005b0b70e08a95dc508/96859202967.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109160228318937.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/56202749525.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/28447208370.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/kupib.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/45558854681.pdfIn PDF document text
    • http://lovesenergy.nl/file/wokunuvigufurirawivop.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bccfae152d4fdc7d1713e2a1bcb0c595/18716367681.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/9496294972.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/48299035141.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/6064140367.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/rasedobukemow.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/gasepuvudagumaje.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/90130688437.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/21397851924.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/10872515660.pdfIn PDF document text
    • http://dnepropress.net/files/file/87514881595.pdfIn PDF document text
    • http://links.giveawayofttheday.com/srichaitanya.greytip.inIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rankguru+app+online+examPDF 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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 17524 bytes
SHA-256: c5d2c67fd7af59f6c728d978a127bab2b9acab5dedd1d857e82dbe3f42c7d596
font_01_sfnt_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 10668 bytes
SHA-256: 6bf3e2877857bd2e4324822a5a82d2a71d05fdba4f79603029bbbabab52fda4d