Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce509e032dcfaa99…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 16:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4a478f6614744f93ac0c192e7488b0e SHA-1: db8f6f02790a1da8eaffd76a59618d4961a2b892 SHA-256: ce509e032dcfaa996ec3a61d13f8fd092d45ce54534caf6ea5c1253b7f5d99ff
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. It contains a link farm pointing to various URLs, some of which are hosted on compromised CMS platforms, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate effort to obscure the true destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://waterreducer.cn/d/files/bufisadofiteromepawo.pdf
    • https://klairtransport.com/uploads/files/ratukodevubuvap.pdf
    • http://veraschwemmle.de/fckdata/file/27482180463.pdf
    • http://architects-desk.com/uploadsfile/kavakufijetemomo.pdf
    • https://africanresearchcenter.com/userfiles/file/fajazofuzobemowes.pdf
    • https://colakcivi.com/userfiles/file/rusekifup.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/paputeputegawepejoribil.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/35oq5ljiebu0q6h23q7mn3rriq/12757356654.pdf
    • http://krakow4you.pl/krakow/files/satenabelelekakadel.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c11bfbbcefe---72362754428.pdf
    • https://adasms.fr/userfiles/file/juxulerarifotisawedog.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mb5ld1cd0tj1g83kag9mfm7upr/mosem.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vi521lf8vl8v1125fau15d57au/16611965939.pdf
    • http://healthywithhart.com/res/file/11667552596.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57e9cdb07---39208057056.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=small+pdf+download+for+android
    • 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_off0000eb2b.bin
436751b82993b7abd859e5130d35531fbb3c86442548ecdf70acd8d01cb2d835		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16580 bytes
font_01_sfnt_off00011623.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 16792 bytes
font_02_sfnt_off00012e3a.bin
b748666e9779026e6e09fc91cf2ba3737d83e1392ba16226a0887fc3464d2dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 10424 bytes

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