Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c01dce809e21dcb…

MALICIOUS

PDF

81.5 KB Created: 2021-06-26 21:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e41ea15abf9047e9fe44156242982c0d SHA-1: 9efdea0ca84a48690dac0d03594f562930e29bec SHA-256: 7c01dce809e21dcb18cae4871fd692c118b2dfb180b0174a8d73bd5e58d6090b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised websites, many hosted on WordPress installations. The presence of 'utm_term' parameters suggests a phishing or SEO-driven distribution strategy, aiming to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=latest+general+knowledge+pdf+free+download PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b353635af8a---5613436977.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/72669092323.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ebaa107c---45935739850.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/lorer.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/favufoxugusimuj.pdfIn PDF document text
    • http://yejida.com/userfiles/file/50111056082.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/96367103783.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2ff7e20425d054df44fbcb226d936d82/4029201180.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160828636c147b---ruviwabolozi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710c0ed9476---kutabeworateduf.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/22361861231.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16091463c6c1af---90931746664.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/90166850787.pdfIn PDF document text
    • http://compsult.net/userfiles/file/68143301324.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/20497574543.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ca52bd8b9d48faebc59149f8d936676d/12900629825.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/luguwibozewilewazoxabo.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/94205606483.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/fecfc78e3bcdea1fb3060c71d07d4eac/56762717037.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce204315f---53452027715.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/76473356517.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hp9vhvja4hgum58shupispbqg1/momerulugabuzofug.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/nivuwafuburojowul.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zumemowevoxubevexulanek.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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 16828 bytes
SHA-256: 028c6ded784b56b62300b312e3cac4429c3d68e83f43a86fbd40b6611dccbc4e
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 10716 bytes
SHA-256: 80b51cae05285fa72fb8c157c116b10509b276141b1c3574d9f81ff0e4348ac4

Open this report in the interactive analyzer, or submit your own file for analysis.