Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cd55106797051c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 10:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb50ca7c97797d90e42f4ab4e7abe75a SHA-1: c3b4c2ef7e9e5b54d1127261b0eb331ad67c2433 SHA-256: b1cd55106797051c994d671918f9c93c293c5b86da411ecc1c4abefe30d4cb9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://promaxsuspension.com/csmimage/file/41174495578.pdf In PDF document text
    • http://profstil.az/userfiles/file/bofozulonure.pdfIn PDF document text
    • http://chokysitohang.com/Uploads/userfiles/files/32427667473.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/demesijemegez.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbede87cc2---27000931606.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/sepanivojovuweta.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414ca8e11a---1382893066.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/7899190507.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/pl02nhh24igb652lptigqodh3o/31207271342.pdfIn PDF document text
    • http://pinxedien.net/upload/files/61529342943.pdfIn PDF document text
    • http://come2menorca.com/images/file/denitorumudexosixafonilap.pdfIn PDF document text
    • https://gangnampools.com/contents/files/febulifabedoremakojebagi.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/bizudinivuzexi.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/24835388049.pdfIn PDF document text
    • https://autoskola-scp.com/files/68364939527.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/besoletoka.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/zekibebuwax.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/sm4kqt11ppeii46suisov28iug/29212525831.pdfIn PDF document text
    • https://cecprint.com/images/file/detixojobe.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kosomisisili.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/85729948287.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/85114422067.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/bilutiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+developer+interview+questions+2019PDF 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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 18200 bytes
SHA-256: 52b6fae5812317e3d1612599fa568ce519f1cede19918aaa8451fccdb5b58446
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 11064 bytes
SHA-256: 2308354ea0eae27878f69aed8be3ec10b9dec2135898e5a975c84c38b2e65924

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