Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa57e2c62953b20d…

MALICIOUS

PDF

84.3 KB Created: 2021-07-08 11:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c57cc9254266d27eaa006e294c2d507 SHA-1: 2c426e9e9504220f6fb972e651e4015e25810991 SHA-256: aa57e2c62953b20daa9ccdce95d48d7b51803590539e767fe9a5b26112851112
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing content, aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4f5455ea2de5edeafe8d1944db9549de/zuxurokawugasilo.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hf4vmaft1hace5quj4v1i6rob7/120699163.pdf
    • http://antifftech.com/uploadfile/file///2021052110281973.pdf
    • http://ural-resyrs.ru/data/file/nupivawefin.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831ac6b0d8a---32381475616.pdf
    • http://strandedtattoo.net/file/lafevukugivirupoxod.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/goliju.pdf
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/20278476491.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/eusqfnfuhouqj564qp9ocrj4h4/tujezosurovuzijeziziwi.pdf
    • https://pharma-tools.eu/galeria/file/xubiroroluga.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/2t6atfd7fkr05m4ejm5ghpsip7/47153685962.pdf
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/jidofepofokam.pdf
    • http://richmediahouse.com/admin/uploads/file/sijefekuzagamamis.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/27e603cdce7292e74d0f5e67c0857d82/zajodaboruzumedomu.pdf
    • http://soflocops.com/clients/67403/File/84016414915.pdf
    • http://lineshare.net/upload/files/20210701033904.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=black+blue+and+yellow
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 16792 bytes
font_01_sfnt_off0000ffee.bin
8bcff7fa6e5c29e2ad5d6eea84f506e03112949219e1473644f82cd86aff32ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10488 bytes
font_02_sfnt_off000117f8.bin
bb552802eefdd05ba7297f335af986bc9cc6e872f309c4f3bdecb421ffe0a855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 16640 bytes

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