Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5543d0b6b3caa7…

MALICIOUS

PDF

242.3 KB Created: 2021-08-06 02:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 850100480834771aad217b5884266a9d SHA-1: cebb2ca2ccf603ec77cb40089a18c2459f28938c SHA-256: 3f5543d0b6b3caa73c8583dab57e7c656ba6a8ffa3efbf5d8371c068d5e363a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains links pointing to a compromised WordPress upload storage, specifically hosting a PDF file. This suggests the document is part of a phishing campaign or a malware distribution scheme, likely using the embedded PDF as a lure or a second-stage payload. No scripts were extracted, but the presence of compromised CMS upload links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

Heuristics 5

  • 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.
  • 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 http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/m21atid70tao35qi4d2rhmfjb7/25737450665.pdf In PDF document text
    • https://dovolena-jiznicechy.cz/uploads/93584696443.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eae7c6fa9---kisajizib.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-25/20210525210758651853.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/83253105623.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad43e66f33---31202902698.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5bb313d6385b55aba5b037865e2260f8/58016755617.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/0tdafocspesc75koeosllq6467/numofila.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f81e43c2---56821620292.pdfIn PDF document text
    • http://juentai.com/userfiles/files/wunaluxazevurovobabup.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/jamub.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/aucm6rsr643kqdaa4jj6qbiup7/sudapobilomid.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bae4684cf02---ziminegovorasegaviw.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/16ba13e17f8f51a7d54ecced5a615ce0/xupukup.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f0bfa81f1352a6283ae480dccc5ef99b/10816910150.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/vifosipeteziguwitesapi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pj24219dkdofp8sq5vgujs9ka3/delukefutekoge.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/lujivowunemuxubur.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d6b122eab---noroxizikug.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/lebopelasubikibubo.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/69120225319.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/pasotopidosuxifen.pdfIn PDF document text
    • http://cissi.it/userfiles/files/60122575578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=%D0%B6%D0%B0%D0%BD%D1%80%D1%8B+%D0%BF%D1%83%D0%B1%D0%BB%D0%B8%D1%86%D0%B8%D1%81%D1%82%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%BE%D0%B3%D0%BE+%D1%81%D1%82%D0%B8%D0%BB%D1%8F+%D1%80%D0%B5%D1%87%D0%B8+%D0%BF%D1%80%D0%B8%D0%BC%D0%B5%D1%80%D1%8BPDF 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_off0003481d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3481D 11188 bytes
SHA-256: a13c6de09f9270538a4fa27dc9ffe6d9816335ea485df251eb9e41b59a3db974
font_01_sfnt_off000361db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x361DB 24336 bytes
SHA-256: c8838d29e2b8309449bd4c259631cf21a618fa26460e74ddf8d459d2587dcae5
font_02_sfnt_off00039f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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