Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b211a82a38e12c…

MALICIOUS

PDF

95.6 KB Created: 2021-08-29 13:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 288463e9382efe54390e6a2d4993e176 SHA-1: 71c7d302cca52316ff39aec4491025099324286c SHA-256: 35b211a82a38e12cde4550c1b8a87307ee288cae91c7377b5bdb2ed76a2f22af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xelutuzivepujoxemo.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7654d881---sofijajagabaduk.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/31c5f6138b7f809c607d26000425ca98/50583012825.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/93131894135.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/p9j5av4n0rco40a33iphhkp1i6/wurunovoxe.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7543a404f8f7a9e7c8859cca5e2af99f/zikefa.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/39180539971.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/33876065343.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/julasuwuna.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/panufuvitafajavanagibula.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609251f86fa38---52284718485.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/guxekapuriguxawigataj.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160716937c6ddf---95539443958.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/62819241246.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/792a931ca135cf26b8044b9386628754/85174982643.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/navadifiraj.pdfIn PDF document text
    • https://jobtiara.com/files/files/79340525411.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/kibodimunitekikatusejawil.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1982493ecb---57882447564.pdfIn PDF document text
    • https://pecsikult.hu/files/file/50547575941.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/81475d6225c4934bc7a0f9bdee9eaa31/bofaxegol.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/xafifaxatukojife.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/69960210319.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/60564042587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=convert+kip+ft+to+knmPDF 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_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 10332 bytes
SHA-256: c69b8c9d465b66cc260d0a1f0b45eb067c871178d1edac6ea32c171953de4b89
font_01_sfnt_off0001284a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 18360 bytes
SHA-256: 14b255ce8b76bb4e0956257d54513dffa25bde775dc8caf303652db2cc948c5b
font_02_sfnt_off00015845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1