Malicious PDF — malware analysis report

Static analysis result for SHA-256 d333f64a7a6ad236…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 02:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bc4ea2e46b5470cda0d3386b76755bd SHA-1: fdf14e369e52335e75c6c04c5509975e6723c437 SHA-256: d333f64a7a6ad236ada9873d94a45c1959abdd3c7d0b6ff20129e3aa1276d5e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bienbao.net/uploads/files/wefim.pdf In PDF document text
    • https://foodvellythailand.com/upload/files/dejupidolek.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/56546642312.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19806445750.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/lukabemoxuzeli.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ddba61b9---tisemenuzix.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-16/20210916091920173097.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/jobeludosux.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614714fa0b213---pageserabuzi.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/54249078393.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f23258d59e---diromuradi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/867466111.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/37664548395.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/35272038058.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/jofejanegobu.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/vuxadevulakimumuvox.pdfIn PDF document text
    • http://leruichem.com/upload/files/91254939495.pdfIn PDF document text
    • http://yoron.net/up/files/30449263089.pdfIn PDF document text
    • http://nenorm.com/files/files/34459010702.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/89803067717.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/97509209065.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/sanolilenabokor.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/tawisusirepij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+fugitive+123moviesPDF 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_off0000b80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 16604 bytes
SHA-256: dbf4aefc0bbed6d7594c28e66efdf450be6a9eb84a68973c04a88058b6607867
font_02_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10720 bytes
SHA-256: ef524783765f08c3b4d14a64e83d5e5a8385e328e42073aa062960172c2eb7ba

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