Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf1ce53dd149dc5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 23:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64e21d8443a469729e61afb8d823fa32 SHA-1: 257e60488129ce5a616c6c27cbff9a02f6651c84 SHA-256: 9bf1ce53dd149dc5fa0098114bbed71615c563f88fb1fe0be3fdb2d01a5deea7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm designed to obscure the true destination, with multiple distinct hosts and a high number of links per host. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a3228c4183b1e42013b61f1b604c6569/26315237622.pdf In PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/kbmcdjurpihttod3ecgd55j9ik/44291809699.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/96940574722.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/54159668497.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa292759d12---62014999609.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/29781749443.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3rpu45ilhbf127k94d9c0b10e3/terox.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/seposafikamiwenisuxitiduk.pdfIn PDF document text
    • https://path.mn/userfiles/files/5224964923.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/53552150238.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/vaxopugisijafaxawidif.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/44618687785.pdfIn PDF document text
    • https://ikima.fr/uploads/file/tusifanexelepages.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/vikozebiwebokixujimukekug.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/sijitetumuneminalun.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/koluseril.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/zazotidaxekuwamoboka.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/45873590812.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pebikekivedutixawo.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/57873982350.pdfIn PDF document text
    • http://plncse.hu/php_data/file/72174437689.pdfIn PDF document text
    • https://blokhol.com/upload/files/26892608492.pdfIn PDF document text
    • https://aitalk.vn/upload/files/30886590099.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610711565e47c---walelusagamono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ap+calculus+ab+limits+review+worksheets+with+answersPDF 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_off0000d277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 11104 bytes
SHA-256: b4b06ff4d40f25acc239d90afecba99d33dced91f656efe6bd45a346f4e7837c
font_02_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 18452 bytes
SHA-256: 8bb1dbe1d6dca6742253059fa6aae75e3edd82862f483350bcbf61101649a3fb

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