Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd9d6a87823a417…

MALICIOUS

PDF

87.3 KB Created: 2021-09-09 06:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02778983dac0d9d575222ade1256de39 SHA-1: 9f29f865259015e4f417f4aafb44fa8d354f7a0d SHA-256: 0cd9d6a87823a4171f80c3633f6c1da0efd98501a96a159bb5390a4a75c33401
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://e-skala.pl/userfiles/file/91708962400.pdf In PDF document text
    • http://wienbildarchiv.com/upload_files/files/30249761762.pdfIn PDF document text
    • http://jljemc.com/upload/files/salexepove.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318cdca0002---bitubovuxow.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/85381087234.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/8b57bm11hdllfs00sttsgtvg0u/borivixabomukalekogo.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109062201244910.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/tebibenomuzemitumove.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/19982901096.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/niduluti.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/wowujaxokeramulilubujes.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613648731ba97---6093629473.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/xulezem.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6ft4t20jfdegtoddqhgvfdorp5/gokavozunajagomoz.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9cdfe37f2bbe4471d7c8f9d921a37b4a/genalivam.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394bf31dab8---64921447622.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/ledobinij.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa876d166---xamibojonidotigadive.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/75363267433.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/90378804239.pdfIn PDF document text
    • http://moneymaker-gold.de/files/sufokeligazoz.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/81856159091.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613323041c03c---neginep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+resize+photo+androidPDF 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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 10580 bytes
SHA-256: 3b4cf498e8cd2f2096e17726b4fb30b88d64c18b802bbbb4460fd902f01b92f2
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 17652 bytes
SHA-256: 5326c369d3c7229b6d9c6ed93f6afd2ec594ca3ef11bad105843fe6636811ddf
font_02_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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