Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18b896e1e2d7803…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 21:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f41e7393d5e44e77387b5cba3d8a0670 SHA-1: 8c92534f3b238a981130ae0efcbb6fbc0d3a3db9 SHA-256: f18b896e1e2d7803a9280eaa538b406f790da32010050371c83e634697535b0e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://perfecthospital.net/FCKeditor/file/suvaseba.pdf In PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/2299983456.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906010927.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/48416476926.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d235b4c131e12609ea082bfad7323581/wotumuwewerewitug.pdfIn PDF document text
    • http://chenruichem.com/upload/files/pidosixul.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/15358543274.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/numefemenetifusuvomawut.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/88207670619.pdfIn PDF document text
    • https://iohrp.org/f_files/files/34890167988.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/mirisuwofawasepevukikikad.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4855b4d94a5a9022bab54cf00c1cf099/78797912235.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cd041404a7883e1c1737efe125f6f7eb/13335996150.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/23036749981.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/72226341206.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/wakujaripokimo.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/nosimibuvakuxugeguzofikel.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/81890220875.pdfIn PDF document text
    • http://hocomesun.com/upload/tovifulofalotikomefa.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210903055421.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4e873895---51661472242.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/zetonavozulug.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27554606913.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/16878218208.pdfIn PDF document text
    • https://etadelloro.it/images/file/nowefoliwopa.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/vobej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=zee+mod+apkPDF 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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 10000 bytes
SHA-256: 9d545a5a23828c4cba0c985ca3e58d4bbb9847e9a1d2b2f417c79adf38d78e53
font_01_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 16512 bytes
SHA-256: db44e448a3767ec2047db11a841c867c86d3b2e5a2a278e378bb874cb19ecf44