Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dbf1788bc6c84e…

MALICIOUS

PDF

84.9 KB Created: 2021-07-27 22:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9376d0bb459d9615c5366ae7a932893c SHA-1: b961160918528923d49be161b02d73483021dcb9 SHA-256: 07dbf1788bc6c84e4437d99360f2a8c57a74ebf98aa36292587e73a9bb065455
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of multiple links to potentially malicious sites suggests an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/wapepeforosoluxefosuki.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b9518678---wajaloguwamawakigo.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210709_043536.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/dovokabavijur.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/vetiwodemexugadewozal.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf974e1218---58752038645.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/vibagafagibekor.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/93b3ea15c708fjce35cm2spje1/9945438343.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b72c5ec33---4157357473.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/69703821803.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d081b68f88---59996624436.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7lj2g44i4tfnp53vuaeb2oht2b/40217138443.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/582a13408276c549a18513c7e514ee01/kizefegozuzukumavozediji.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76967859832.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2c765304---50562977363.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q3d02cfbb3h08p401p1qjnrjs4/64706731065.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/vijigixa.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/72644706994.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/72117904114.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/95212399997.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/18622077917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=grade+8+exponents+and+powers+class+8+worksheets+with+answers+pdfPDF 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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 11244 bytes
SHA-256: 8d5f4d36e44a1ff67322b57876dc9f5fc16cc2f0edf11075ca7aa9549e83030e
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 17360 bytes
SHA-256: 3c0f00553c1b568d8f0fafbd3dd2742494483363626b3c2cb9e314e4bae59d81
font_02_sfnt_off00012c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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