Malicious PDF — malware analysis report

Static analysis result for SHA-256 b093eea6a48589b9…

MALICIOUS

PDF

85.8 KB Created: 2021-08-25 21:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 921823e855dfb74be6b67cd75ed73ddb SHA-1: d47e1f1dbd0c1bd5d3b619208c16af155aafd435 SHA-256: b093eea6a48589b90505d052fbdfcb072c181f9fa8a89a0a80a3864336963bd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites acting as hosting for other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1ar4u35djhp2slu77ap1r22fhi/wipanusifixowugokeju.pdf In PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kg740e8rf10tnj21i0talrkhk0/ravaxawiwavedus.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/81047334641.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/51925494757.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/20368707714.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add396e9aa1---5122325172.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/46404904263.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/049a1cb59c292e5b1e0acd812a255f40/24374194597.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a5e3ed54f90d102f90df5610a3e126af/69070542481.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/90006911131.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b60813e1b28139549251ee78b781142/75709244102.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/bitowatotevizadelara.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sie5l0g5r0rq40q66sc069gej0/30936713771.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/saruvipimulidifet.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e769101688---42186026467.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/52042337897.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/bejokuwazomazofi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kiwovosuwuman.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c794fbb35af---xanalate.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0916574df---31784457503.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/66563017965.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4cc501900---wesisalivepotanovimuzej.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/xitekinajizetovi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/61269002897.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/71661403831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=human+anatomy+for+artists+sitePDF link annotation
    • https://medlineplus.gov/anatomy.htmlIn 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_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 10532 bytes
SHA-256: bf27ebff74e1aa4dc450bf1b551ef1f486c3d3e6274e6e653e5866fae54321ff
font_01_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 16928 bytes
SHA-256: a7c1fe72be9466d4070691003563295cf685c8d737b133c831072013364a6665
font_02_sfnt_off00013142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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