Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dd43eee3dc95a4…

MALICIOUS

PDF

116.2 KB Created: 2021-08-10 01:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef10e23c1bcc85f11d52461250ab669a SHA-1: 9136fd1bd453fdc10087925c8b0c609f5f9f6670 SHA-256: 12dd43eee3dc95a4e6dedaf1e851e63582b791b874fceb87f8b9e1d0734680c8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://feng-shuiworld.com/userfiles/file/47138160982.pdf In PDF document text
    • https://paperland.bg/uploads/file/32583631090.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/gapowunobetu.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/nitalux.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16108fb06c268b---59347552245.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/45481570128.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/sozipidasolojoz.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/40872919432.pdfIn PDF document text
    • https://egf.tw/test2/images/file/wazomakipigoleju.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c864c54600---89068961471.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/tonadem.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/b5674e884fe6b88515bc06f6bec40818/13885249906.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/99dba9cc85d296dc319da29eb5da1d4e/begamuvunewimasenenoba.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/xewonegipabi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lasufemeravetigodorij.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/79030454983.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/garovug.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51652143623.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/47101309805.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97467c1554.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/5e16fe6e7a1a95f907fbdf0f56dd1fb5/64149039703.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3b45193c---5682641049.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/cabbf251af9944448625795b964875bb/64335372485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cisco+ccnp+lab+manual+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_off000163db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163DB 10724 bytes
SHA-256: 1470d5e39a15f657bb383e4f527fb7bdae2e3d00e6edd43652add19aa47b90c8
font_01_sfnt_off00017c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19442 17648 bytes
SHA-256: a086ccb5474d8692406fd91981e9c08383213ba86c9a7a7874df4d493b75545f

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