Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6368067a370d07…

MALICIOUS

PDF

88.1 KB Created: 2021-08-08 04:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd9c7250bd499909be2ae8d563a6682c SHA-1: ec988706da9855e682bb2d24258e610ec0b65447 SHA-256: 6d6368067a370d070be11d58cfe8583a421d5b2903fabc98ff9d7fbb5bbcc29a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting domains, likely intended to lure users to malicious sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0367hjj56902e7luqpsdoa8if7/tevodip.pdf In PDF document text
    • http://thermcom.cz/userfiles/file/jufemoretog.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210724014515.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/vogisobuxazotovejuferitoj.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/67680362365.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/4522833136.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/84022645364.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0b129723c---51701679151.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/1090470912.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/nodunixariliwep.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/xuliga.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/xurovutetemik.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/33885db2e68fb99c82c441a17c6ae60a/nabunuz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160900838a943f---libelezinagesofaf.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/sorumafekejem.pdfIn PDF document text
    • http://attlas.center/userfiles/file/92112065362.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/dadama.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fasofuwizakuzemezedadasu.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/16811347512.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/396f59efd44406939de57a9625922f7b/suwolajafam.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/70396665626.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba8a20758---feripakamuk.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e017b766f68eeb3ce82e6b2a520346a0/34608025871.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-8/file/40139912193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+program+a+clicker+keypadPDF 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_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 17240 bytes
SHA-256: 1dbc614ec68240aa7406dcfd0a0065bf9f9b8bc077d5f6ba977dbba88b45b3a5
font_01_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 10868 bytes
SHA-256: 777ac4c93d3a9b51754ee0d585129906ecdcd6d87d60073606f147eb0c4ebeaf
font_02_sfnt_off000137db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1