Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cfd29f2dc6b313…

MALICIOUS

PDF

85.8 KB Created: 2021-07-14 05:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8f01ca0ef1a8389acc74935adf0752ab SHA-1: 58916e2d1a6674cfb1c1a9f1e9293f63d72dfb79 SHA-256: a9cfd29f2dc6b313d508a015a929dff1e52f047eba7324b49e730354ca7d2206
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which are part of link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, while not fully decipherable due to obfuscation, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=synthesis+of+carboxylic+acid+from+grignard+reagent PDF link annotation
    • http://roland-toys.eu/userfiles/file/62596208254.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/vekuduwif.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/92080259964.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e0b8b29e---20441217657.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/nnbi48tpk0bchtqo1flcm6jr0b/tazagavumonuvuba.pdfIn PDF document text
    • http://sowitech.vn/upload/files/8689833478.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/basumu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/10249116877.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/dijetojofaw.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/vixikanavo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/462f5d6f8fe2613fc9182eb262edcdfb/2502999929.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/lexorinab.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad7d7bb9c---zujegalimog.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bce6edb0---rigopapudagu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j4tvdt5hid4cg4qjk9uodn9nc5/94245521957.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/19c742beaba8020d671e2a66abb902f5/49399176732.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cba312bb---14341686040.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e1a47b68629d6d9fada5d98c5fa9d6bc/81548371377.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/nikoxuke.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/41219516927.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/kanevusi.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/bomapetu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6iiqck4n9u71jmlfnhq0bviei6/jugilozasif.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/pometidotavamoripixe.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/wogoratirolubivuxu.pdfIn PDF document text
    • https://luminex.pl/upload/file/39193992104.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d294eb8a7be---somopagutabavidi.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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16772 bytes
SHA-256: 02e45e6cbe685acd0796bb82cfd367c971592b5e93842d9a8f222b9f649c1b11
font_01_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 11352 bytes
SHA-256: 1d8b096b20a7c2d754b0d701ccfddac89961ed876da96efc1f438cfd46914455

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