Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ed34fadc7978b5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 00:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d4d268f2500e9e2bda68931ef188328 SHA-1: 3cf9dc88ebd7acad0836f4ce6ec9826ac6609936 SHA-256: 12ed34fadc7978b555e4e954ac70449708f8cb913d41239b1b914b39d9afb567
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 CMS upload directories 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 via these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=chicken+tetrazzini+with+sherry PDF link annotation
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/83752733960.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gubewokivaweki.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/92688405576.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a062d363a9136b52c49a517448ccf8bd/jesofalakusowuwuperoliba.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16241269761659737882.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/524f5b8bf6a4732e628356ec38c23a4b/rixugupemolemeda.pdfIn PDF document text
    • http://heizler.hu/files/file/14257073762.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0acb9f42d---xijomuvuzu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078bf6463f3---90106188671.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/94760130254.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f97a808d682aea51806b90bf8eb33a92/fibog.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11623103624.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6817bc9096d805fbdee59cd4dc81f683/6378148113.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fe419edb8a3e515a2f1f983d9845b828/lekigevodigopuruk.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad755e36d---59196298375.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/fesiwutuxewokuvokaxaxibo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/31036306553.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/butokutasofasowuna.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/zejunemubunut.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/36130730744.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/41874449380.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/21370829854.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610624b9788ce---22181362171.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668bfa5078---67736186086.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/1112649866.pdfIn PDF document text
    • 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_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 18480 bytes
SHA-256: dc07954f89135069c57e81c74b5563f511e89b3ee06b553f03fd282455f8509c
font_01_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 10544 bytes
SHA-256: 531c10b6645b110286465c36511772bcfb2ba42174580d93356ef4700ac8cae7

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