Malicious PDF — malware analysis report

Static analysis result for SHA-256 7526608ee2c4a463…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 13:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 569d6d584902f0c2cb41bb500836fa49 SHA-1: 5579ad83077a580543cd9ee7b4fcae1fbb1cfe68 SHA-256: 7526608ee2c4a463850bf9bedbef80274da27ad4919987abcd45c39084afe67c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.bash.cl/media/file/lopaxiruvupojuvovi.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gubafikajorebaloka.pdf
    • http://adas-muko.pl/photo/file/52970907666.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/62539280643.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/76402438114.pdf
    • http://divorce-difficile.fr/userfiles/file/kudumovuditepaso.pdf
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/nilefadizetiwupegobomez.pdf
    • http://les-dvorik.ru/userfiles/file/towopu.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/1395213546.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb34eb850---77640536462.pdf
    • https://mysilo.com/upload/ckfinder/files/32228721114.pdf
    • https://iwistw.com/upload/files/xegilebavideweg.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161397dd738636---tipufisigoxi.pdf
    • http://giaphatmed.com/upload/file/72709788317.pdf
    • http://gwtcs.org/Content/uploads/files/31848102480.pdf
    • http://avanti-kuhni.ru/upload/files/64550167545.pdf
    • https://ljlconst.com/admin/images/file/12079160962.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8199476f1---68921617009.pdf
    • http://xfswchem.com/upload/files/62753000311.pdf
    • https://sfeerweter.nl/userfiles/files/wovoli.pdf
    • https://venefoil.com/ckfinder/userfiles/files/23907515127.pdf
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/betaxaxafutopit.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/86940079660.pdf
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/retote.pdf
    • http://tbeaindia.com/userfiles/file/98679308836.pdf
    • http://elma1.ru/!upload/files/12178629938.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vidmate+link+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c03d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC03D 16792 bytes
font_01_sfnt_off0000d84f.bin
16e7d818e07612f868a1d176d02f8bd5ebbe6af1530abf4800ed0d127e006987
pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 17304 bytes
font_02_sfnt_off0001050e.bin
81c6aa00c8e4101eebe3573bed03c793bd0e85a83f94fc78816c73b1213aa6fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10224 bytes