Malicious PDF — malware analysis report

Static analysis result for SHA-256 537344e8d21967f9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-10 01:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d78e9f032e0f1e003f2ae0ca5d68f62 SHA-1: 1ed33e10b98f245ebc108ce9b4c4ed5cfe5f8387 SHA-256: 537344e8d21967f967bf171e6dfe30fe5ccdfbde6b68c76dd9373ec55945dafd
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on potentially compromised websites, which is a common tactic for phishing or malware distribution. The presence of multiple PDF links and the 'Download Button' heuristic suggest a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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://ipsaix.com/ckeditor/ckfinder/userfiles/files/76983315139.pdf In PDF document text
    • https://skl.deindrukdemo.nl/upload/files/zuvazovagav.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f53bef11d55634fed144dcf7959d40b7/42979400647.pdfIn PDF document text
    • http://akcco.com/userData/board/file/vunaravijovinufitig.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/06a13700c32a4b7546ff9a2ad9ad2051/80940251599.pdfIn PDF document text
    • http://www.pvvc.cz/files/xezazejumi.pdfIn PDF document text
    • https://sanagustin.cl/files/dasawitisujefowejumedivap.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/58007816717.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceea4c46f---xetituwajos.pdfIn PDF document text
    • http://vina2002.com/uploads/files/76901864859.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/17246914606.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/sisagak.pdfIn PDF document text
    • http://aurora-c.jp/files/files/nosalukak.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/86154569939.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fe2ebf9---20931179844.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/xafidujipilunasevawam.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/dumovet.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85209b5ba---19520690670.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pofegosamune.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090715553173499.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/mavinulivabarebamebonamef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=monster+hunter+espanol+latinoPDF 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_off0000aef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF7 10440 bytes
SHA-256: 9787c807f703719739951e0633d202ea08d934cbc1695348f56376def112313c
font_01_sfnt_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 16600 bytes
SHA-256: 75d88427b245fa23a90a4950d2e0b752dccde1a65a02b7ddd0e7e1ac7bc3260d
font_02_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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