Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df58c3413284257…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 02:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76bb17142e4894e4f045ea2343b66827 SHA-1: e1a75356abe869836741be57cdb0287a16618b48 SHA-256: 4df58c34132842573717eeab69c32d1f8ec6d3ad18f503b06d78edf9aa76bdd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external URIs, many pointing to disposable hosting or compromised CMS uploads, suggest the document is designed to redirect users to potentially harmful content. The primary attack pattern observed is the use of a link farm to distribute malicious payloads or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://solarexperte.ch/fckeditor/editor/images/file/waxapikavuxeruwitapejo.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/92508562772.pdf
    • http://raylutickenterprises.com/userfiles/files/jimepuxigave.pdf
    • https://fitness-sport.it/userfiles/file/58544229341.pdf
    • http://mackyz7automotive.com/js/upload/files/tesiwudawezezuzavidutij.pdf
    • http://pickup-ws.com/userfiles/files/41446058226.pdf
    • https://electroagro.es/pub/files/24559050883.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/52ab55bd453830d570ade51ff8ec545a/3242411536.pdf
    • http://szwygs.com/upload/70375324796.pdf
    • http://staractivecollection.com/resimler/site/files/81828457897.pdf
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/wimasejinivupevuxogivawe.pdf
    • http://hoachattn.com/image/files/ruzasepodazuborawanij.pdf
    • https://uat-tunisia.com/userfiles/file/60921498329.pdf
    • http://mirutte.com/newsfiles/files/pofaso.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365be88c32---jemujibixefipozowimakogis.pdf
    • http://artikos.pl/userfiles/file/12541252946.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/rovuguvuvaxevogabekupujax.pdf
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/fazivurafeni.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/41093407353.pdf
    • https://myvideoclasses.com/ci/userfiles/files/doxurivepepuresus.pdf
    • https://e-uchebnici.com/img/file/nokofela.pdf
    • http://svenskafik.se/uploads/fckeditor/file/mefumi.pdf
    • http://moscow-vernisage.com/files/files/tijovumuposixe.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfa2b645c---pifuximet.pdf
    • https://farmacieitaliane.com/documenti/file/tovudopekidezenenezadi.pdf
    • http://solarissoft.com/img/userfiles/files/vutofumufonolip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+platinum+rom+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec84.bin
9d00b48f639dd707b6b8f78165b73df2ecc8d00d45df940676cf1a61a979f02f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10664 bytes
font_01_sfnt_off000104b4.bin
19b7f556ab66842e620440974c8d289013d0569b4c1b49e695684835c8c7f74c
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 18796 bytes
font_02_sfnt_off0001361b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 16792 bytes