Malicious PDF — malware analysis report

Static analysis result for SHA-256 73414e1f006f03e5…

MALICIOUS

PDF

96.2 KB Created: 2021-08-14 12:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 305b4f9610bedc6b54dfb3154b642db7 SHA-1: bfe7997f3bec7eb80ffe38b0f77bc9f9685813bb SHA-256: 73414e1f006f03e556db2c619be4ead32d5823678d9f48f8a4f0140d3a0aa93b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly imply an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ac1mfub7g6cinjvfao9nfebjoj/82306436569.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d62882dcc95d5c0725c9e911be40901c/jubewoponafaro.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/473332a713e210f1589ad4d94a3eebbf/25254132060.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430021113790164.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/dimavaruwogudig.pdfIn PDF document text
    • http://praguetransfer.com/files/file/vulofawejajenavegi.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/sanegife.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c740eab8679---gewemufaxojo.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/94184415462.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/15026552325.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/52859870892.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079636bb1656---71988605106.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/jabewosomotuje.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/90d56b8b8e38ee10bf305f1bcdf8ed0f/26092043431.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100097b44aa3---tivijokida.pdfIn PDF document text
    • https://patc.fr/imagesfile/74482509353.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/a34f9cfe752211cc17a9b22e920524ff/vowojuvosuzoluneluvi.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/27218494555.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c386814715---50180846437.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/vavude.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/60213752248.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/007b6ebf69123b1ff8188cfcbee9ecaa/14615878649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=google+chrome+for+smart+tvPDF 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_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 19864 bytes
SHA-256: a207aa177a3dc1a2c8bc746e34c785c2813032271a724f87618175189b7d6760
font_01_sfnt_off00014285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14285 10692 bytes
SHA-256: 40f351c8fb25ee27efe6ab82a2511536b95c7fe7bd183deec7ccea05699a18ac
font_02_sfnt_off00015b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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