Malicious PDF — malware analysis report

Static analysis result for SHA-256 833238d3eec30bf0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 14:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f47008ef1343fe27e861e54dc02af12 SHA-1: 7908345a2e8ac202499eab898a52a0d7381dccc2 SHA-256: 833238d3eec30bf012a93c062e41bd638fa096212d653686c5b8bdd3a61d0f93
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms points towards a tactic of directing users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lnv-cnc.gr/userfiles/file/jeparuxaponixololaxi.pdf In PDF document text
    • http://goodfortune.hk/UpLoadFile/file///89417682136.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/dagowapinuneranofezuxo.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/lafijupenobitaka.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210904_BD1FB669986D1DFC.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd1a32b15e---32519582332.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/37831169495.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/tonawanezimujirigafiwivuk.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/4098057623.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361e09a72c---34890012660.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/75599596319.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/navojitenabetuzeg.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/32082022069.pdfIn PDF document text
    • http://ge-mak.com/files/79821581962.pdfIn PDF document text
    • https://ptogel2.com/contents/files/siledake.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/47120177827.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/nokudabivopitegodilimi.pdfIn PDF document text
    • http://talesma.com/E/file/tujisemarulokeminedis.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/dezarojunixaruwewetona.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/rifagafukezaxewapatixepal.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde1370eff---84812519397.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/25970242896.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/4821674996132cf40e6003.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nutafowulejevamiwetupamip.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zelize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=solve+for+x+triangle+angle+calculatorPDF 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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 17760 bytes
SHA-256: 37c5163459529b2cb28fd9eea9c8fbff4b8840e916beab5561a0dd0e992ddd02
font_01_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 10684 bytes
SHA-256: 67b00ae56461032e71c09b45c43b1b59c9d57c5aa07917817bca0f7d2891109d

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