Malicious PDF — malware analysis report

Static analysis result for SHA-256 512dbebece4d35a1…

MALICIOUS

PDF

75.3 KB Created: 2021-07-24 06:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fe2aa861fd3a649e62d96e94d4a2615 SHA-1: 8cd1b606885127983a7ffb8bba31ea5480642035 SHA-256: 512dbebece4d35a19e45ba4036054defd1e63234e481a7704c9a210e2398eba1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. ClamAV and ML classifiers confirm its malicious nature, identifying it as a phishing trojan. The presence of multiple external URIs and a link farm heuristic indicates the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e2c6542135868d6ce63e7d610ed0a436/natibinabusuxenimuva.pdf
    • https://siam-royal-view.ru/data/files/9409889207.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/de9502c032fcff533268e04a5ca97eec/jujijizakakiged.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f334758ae72---fasibulimedojuluterifobig.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c159854833f---25263717719.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/10964302007.pdf
    • https://chungcungoaigiao.net/uploads/files/94155618965.pdf
    • http://nusamulticentralestari.com/Uploads/userfiles/files/74546276756.pdf
    • https://lesfeesdelhetre.fr/upload/files/68647571569.pdf
    • https://bravo-hk.com/userfiles/file/duroxi.pdf
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/rafabudezerolikuxufunowut.pdf
    • http://foto-klub.dk/userfiles/file/wapetetirevovasives.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/aecf2ed01768bbebd372c985b08f14b0/wubaridevukofurosewedeso.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16091043546.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76462a2734---91576896882.pdf
    • http://yossy.biz/userfiles/file/tipibijizesogipajita.pdf
    • http://brmxn.com/userfiles/file/20210626041636_d6cezl.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f64d1530d---28089649514.pdf
    • http://yuha.be/_files/file/15871432815.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaeb21662---wivonaboneg.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/35q890m1lbfvcprg9qt1kbdgi5/bobaresuzugozelasekiweg.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a0aa6ae16---pixovaramugifakegubasik.pdf
    • http://fjzy18.com/image/uload/files/durokafelutaxulaliv.pdf
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/xirozuzobameve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=water+has+a+giant+covalent+structure
    • 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_off0000c69c.bin
347dfad4bbae2ed3675819d04b02d8d64016f097bb978042e552673fa158815d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 10668 bytes
font_01_sfnt_off0000df0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16792 bytes
font_02_sfnt_off0000f721.bin
ee570a85f80665acca1ef84b29eda60ad4e305d7662ed88ca99d77ebf96a052a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 15540 bytes