Malicious PDF — malware analysis report

Static analysis result for SHA-256 9784ce2bb43a097f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 13:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aeb9c6f847b5928e338439b359b49d50 SHA-1: 441405396d9746afa9bed815f5185b61ed21d24f SHA-256: 9784ce2bb43a097fe38f4b4d26fd5c068ceaa3d996998852737b49aefaa98aec
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document utilizes a link farm hosted on compromised CMS uploads, aiming to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4461608fa---1936418867.pdf In PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/67474410187.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///59356870181.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rnkbot76g8n7ebdiean48l7na4/67962713483.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/sakibozetufotojali.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/7f0b3c0563b8f1637fc76114a8a880c2/gawilijemum.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/lovonob.pdfIn PDF document text
    • https://onecre.com/images/content/files/ruxevadikuvupugitazeguf.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6c653cd8---26436530691.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987cc005cd---pugikanan.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/84080916329.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/kabajulabugipujowi.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/lirujesawirilifivawut.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/66752034238.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd931f72a02---61160014979.pdfIn PDF document text
    • http://kodemari.info/data/files/46003130032.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/71468240694.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b54a9334f48b448701f24b1e298f5a8e/kejamewogepamebubujejirak.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/72614344317.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/91809648965.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42e281b3d---98819897093.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/55051025131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=june+2019+current+affairs+pdf+affairscloudPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 19676 bytes
SHA-256: 02814aac5befc9a5f52fb51a46109f4ee9e7595e92dc8eba6af535b01fd3d201
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 11164 bytes
SHA-256: 2e94ebb27b3268cc224f3a52f03a72fd99cdbdbced89ab98683896e124b5f95a
font_03_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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