Malicious PDF — malware analysis report

Static analysis result for SHA-256 97004ad50a271221…

MALICIOUS

PDF

98.3 KB Created: 2021-06-28 11:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6358a915e3ae065b1d28e5fce1127cca SHA-1: 4bd6a7edd69f4d436073ac2bf2f855ca8a727a63 SHA-256: 97004ad50a271221bd6ae601c9e968c99af96f659edfae46405f08bbc9a68e81
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and heuristics indicate this PDF is malicious, functioning as a link farm. It contains numerous links pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure suggests an attempt to exploit user trust through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • 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.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/2cb6c2803ecdf439c5739ffecd53cfaa/55637147709.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/buwevamuri.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609424035146a---80603439450.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705067bfafa---57460962424.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff577d226---38779261660.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/02d8e1889952fabf7a0b559faf3e0daa/59653772158.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o47psnai55abngullcjbicke42/66022726376.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/26899052451.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xajizifaxolanuxatojogami.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4687dcd3a8---95502967077.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79bdad625---moziludanobozu.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071893a32f47---72803602024.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/xotuwezudoni.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607750fb1bc9b---navugul.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce78ead142a---makesowujepizitelafetib.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/worikinigezixare.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/96977651550.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a53af41086b00324d409301a32c79c63/948850702.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d2edc98cfe204cb6c2141de341bb67a0/pasojekoxorogajuropakiji.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4nukbg3fe58rh060dr1b4b4h9p/xabibujuw.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/517037c9fa27d75da814ada5af30bbf5/20778597917.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cfc0cab43---ropiwuzugukorigabojofele.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608743bf4004c---9370020111.pdfIn PDF document text
    • http://www.moyekolodin.com/files/14034884455.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/84b1831d4ee899d16ef84aef1c6e6ff9/68054426849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+dragons+of+babelPDF 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_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EB 18884 bytes
SHA-256: 800fd33cec79e03536193e60c980df4035c53ed20d20e5bd2427f2721865e499
font_02_sfnt_off000162cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162CB 10544 bytes
SHA-256: 4f8b5b3ef620109d02ed1cdc5bafe486dd7d22ebe4d1bdf14ed87ec71f5f0e21