Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a00365dffef63e8…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 14:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4087e76fe9af05ce2f19ba16fbf9b0f SHA-1: 0fc5011dba83bcc74b2341fb0f4ecd84e738a992 SHA-256: 0a00365dffef63e8a11bc554a99760ec46fc6e3936f046a7824e1b461149c492
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as phishing/trojan. Heuristic analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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 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://synerhu.ru/uplcv?utm_term=g+syntax+apk+pubg PDF link annotation
    • http://asupuro.com/user_data/image/file/54044196333.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/48398196256.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/biwirisafuko.pdfIn PDF document text
    • http://glassick.com/userfiles/file/mapumup.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/1311000894.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/davapelumud.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/vulin.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/31490688331.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pakunupip.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/ganabopokidudonika.pdfIn PDF document text
    • https://renetravel.ro/images/files/77777326981.pdfIn PDF document text
    • http://honghuibio.com/d/files/zijasawisenifagenujotelat.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18c393c3a---fodigaga.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/maposagapuzegap.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/tezuj.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614216970fc42---68082334724.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/fokenevoguredamikokagaj.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/68383545209.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137b76b40db2---77546225107.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/juwukagixodifoguri.pdfIn PDF document text
    • http://tzsunup.com/upload/xukewatixitufiwinijusa.pdfIn PDF document text
    • https://pmms-online.com/assets/file/71532708467.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/87108075319.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/takeve.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/pugumimosodusa.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/kumipelinanamodulut.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614631f49f493---tujifokajowatav.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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 10524 bytes
SHA-256: c8d2c9f626a4b3bed31db33b400078773b88b1102d425d6e64b81b473aef599c
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 18808 bytes
SHA-256: c03c475c747070db4ed8e7209562b9a1a8401a5724fe3ad6e33d47345641dcc3