Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fed3031a639ec60…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 19:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d81297ec343c8390e91a2816998f6a1 SHA-1: f78b202ec40db12cf764adf19bb80ab8e52a0300 SHA-256: 2fed3031a639ec605c889cb5fe2adb4eebe27857b733b86e2259b870494595dd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/feb4d63daa94bdb257088ca07ae56ac7/wakelavirusigokamisibuno.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3ebc7608b9bdec3ad10dad065d357c84/topazawovakoxipo.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/dijotibojobubogaleb.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4c4sbjpkuovrjn8p1g12m5ontl/jaxegijediwoxiwidovatasu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085b9b7b4837---24628415924.pdfIn PDF document text
    • https://premium-house.uz/images/file/4682848490.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/tufaxigo.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/39198026839.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/75507c3d4f7a213772e7fd3af5777c94/jerovag.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d42546b41---45824431752.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/qn9hmi64cs6en2t9a4q03a4rg5/wazudow.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a47120565---58761062677.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/1430217968.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/jezakumujonapuwawewusaka.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/69579728228.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/19552626590.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2cb7a104ebad2c7c8f05f9d9dc0de5e4/91752547822.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/0bdb1ae19982fcae2f85014f412900e3/72637934416.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f2d5f23a5aadee4a1613ee1b6d4d691a/44115607503.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a74bff81aec---gipenanavufemowef.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/2honjeo5lg7qsquu9k35r3vj6k/75185854606.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/45249088277.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/33990997255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=iphone+answered+on+another+devicePDF 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_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 10668 bytes
SHA-256: cea97bb27925368a41ad54877418a585d238247ca4f4a8b6e32f2c7d27bb672e
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 18176 bytes
SHA-256: 72ac8fdb300aa3a84b4e6f680f77c3d22fcf1b215155c6a63dec1d6ff5a64d53
font_02_sfnt_off000134f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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