Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddf4ba8986b4afb…

MALICIOUS

PDF

118.1 KB Created: 2021-09-08 09:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72cded0041aaf86330627ba4c47eb927 SHA-1: 01015f778f8023f67dce7883e2986d78918195de SHA-256: 8ddf4ba8986b4afb41be32751a58c205f87839ac35ea581e517841ce38ee4a33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple external URIs, including a link farm hosted on potentially compromised WordPress uploads, further supports a phishing or malware distribution vector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wohntraumgmbh.at/42721060190.pdf In PDF document text
    • http://alituncer.com/userfiles/file/nabevozotenonadufuvuxuli.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085989e3929a---92347633861.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/xibilegewisilo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/volodokedejuwekaxun.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/besifamavitosigojeka.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/wizalipujigopexa.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/lodagibaziwererijuk.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/79235344841.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/25cc3a0091a7a893000186674ffc8cbf/84827332524.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/62892564451.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dce1cb270f2---51697078895.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/gapexeto.pdfIn PDF document text
    • http://one9five.com/userfiles/files/rerunewiritug.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/wopolujuwodox.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e8435c44df96babb57fdd13c26c398e3/vefidogat.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/nijugapobi.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/93279808055.pdfIn PDF document text
    • https://immobilgold.com/file/jirugixomazini.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/relami.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/gagedakojajejesogetifebon.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/raxizuropugogi.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/jenotisujoziwetagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=baby+bestiary+5e+beast+companion+free+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_off0001665a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665A 11176 bytes
SHA-256: ff87dd39852cc151951edf444461ee9a10a334e63f1ce3a7b9ef259912bf7836
font_01_sfnt_off0001806c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1806C 19164 bytes
SHA-256: 211ed1a5470da035f3fbb8de6e0d052276246031120297aa7987dcdba51e4442
font_02_sfnt_off0001b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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