Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bfd7de7b5af1ff…

MALICIOUS

PDF

71.0 KB Created: 2021-09-07 00:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d795508ec91b3aa10ae4be0024ae8ee SHA-1: 7b5489219afa3319726ba7cfd26f42436079ab7e SHA-256: b3bfd7de7b5af1ff334356a600124f68c2c6f852b9c2110dcb1de01eedd620e4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a phishing lure, utilizing an image-based design with clickable links to external domains. The presence of numerous links, many hosted on compromised WordPress sites, suggests an attempt to direct users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4e7a12c37dae6886b646094fc94bbb4a/lulazobuziriwizenenitijo.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3eaa47fb1---5517260612.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160721db26fa9d---junuv.pdfIn PDF document text
    • http://df-2.de/images/daten/file/31855968830.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/76336096106.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0893b824e---2863631066.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8c2a53370e51b7aed06becf88333f16b/vatejojibak.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f16d82bc6---60466917399.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/devanabolikare.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/88084942247.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/lenofanisefuxolux.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/qnbetuj0q2nfvb3gtp7cqbfgvt/xotitanonazuxijozuj.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/fekatadavowiwekoremamado.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab795cd2ceb---zupawojezatum.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/23333362466.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1357d5879---93355686019.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/gabilira.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kilevamiw.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50001915555.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/daninegegofozurevibaxek.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160903e4366057---95999340000.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/70526206937.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/jagetosoza.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f0cd5285eb2b3e464b6d07e5a78a20d7/63307521184.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd65af548ad---tupepawufelogasazulimejux.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de5b30198e2---14252429843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=petroleum+engineering+handbook+volume+iv+pdfPDF 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_off0000b94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94C 13992 bytes
SHA-256: c4493792f29a8f8afac1f23ce08473d66de2ed9fb05f643b61d25af85bf157c1
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 11176 bytes
SHA-256: 50fb7d6846495a655d7ffd8c5fa5cede22a2cdd7a2734db07e96f6f6202d3a79
font_02_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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