Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2531a5d4439debc…

MALICIOUS

PDF

100.3 KB Created: 2021-09-23 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8668003bb720ae171d86c3c20a5aa31 SHA-1: ab7f1325fd5fbc422cc1192b9e486d16f5900f68 SHA-256: a2531a5d4439debcae1a948947adea4bd627dbab0536bd05473931e0e5a79ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://perfectionistpaintingnj.com/ckfinder/userfiles/files/lusuxebijuzozowumusomot.pdf In PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/7591614082.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/85073155103.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/37087630513.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/30f6701f5bfbfa34744307ea25834d33/55662805178.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614963cbf34da---82896229505.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6993950164.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaca22bca---40960087874.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/81278052613.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/1111632335.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/72512231011.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/81831604248.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/zenetoxojalujuge.pdfIn PDF document text
    • https://zagi.hr/files/66890529826.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e731a2f64---66431706883.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/jokipiwijovajar.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/33516453748.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ab307fd4e08343970ee07fc2491df78c/naxosuralamalomufulupi.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/rudivamujomowebop.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/9416800627.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044df51945---80462747242.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/82112636313.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/58814712365.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2beb2ea23575d79ebfed313a0196ce0e/28973349102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lollipop+version+numberPDF 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_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 19284 bytes
SHA-256: 2609349387514f1bff8fa27c66641cefbdaf9b313dfe25448d555a376f29f4e7
font_01_sfnt_off00015418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15418 10416 bytes
SHA-256: 0d76a2227db9cc0639456b962f9a97713b9dba6dd6a880cfd35d51dfeffa6d5b
font_02_sfnt_off00016b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1