Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8b0d338de2729e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 20:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51bfd8c6f98b71a2a3e10d235aa9e28c SHA-1: 69b0391e3bd8eab208d27f881f83f79f2cf29345 SHA-256: 1d8b0d338de2729eadf1c015d424616337204172c50022eda522196be87a796a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs and the nature of the heuristics point towards an attempt to exploit users by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=surface+area+of+a+pyramid+worksheet+pdf PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1ca9a1cd---fimoxugizo.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/12648392704.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611666c3d614f---37731141934.pdfIn PDF document text
    • http://apvn.info/userfiles/file/36558893875.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d2fb32b05531eff89feb9ec5a7953f1d/87726884304.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/41364257151.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/dixebubuguduvesawugurugis.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0e6a50e75392e1e7ae0b5176a286af65/pizapefolojobixaxiderinaz.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/44a5d25ad25fa25cd9c2e1f167082774/godebo.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/70848908497.pdfIn PDF document text
    • http://schokofontaenen.de/idata/15674501192.pdfIn PDF document text
    • http://fygl.net/uploads/file/04102740111.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92e1e7360---95398368252.pdfIn PDF document text
    • https://aedwea.com/upload/foto/49348469487.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qopia19n6asmt8065qi2o69s56/sexuxavisomevudosupixifab.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/76868069637.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f70469b4a2---loluzagefofa.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/38525641069.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/82128609495.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/samidedofazi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/69a08da09598481fa0f2ff9a61d5f3a7/zaramejekogoduf.pdfIn PDF document text
    • https://codecs.roimages/file/bejerujafejiremo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e4ab824331acc6dde6e557b535430f82/nelasupo.pdfIn PDF document text
    • http://imosa.asia/uploads//files/202108121100042653.pdfIn PDF document text
    • 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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 18408 bytes
SHA-256: ca6628a3bf9977685a0ad9d93ccdb264b72964b6928a67a9228cd86b49b07dd6
font_01_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 11204 bytes
SHA-256: 37e69e1e8f73b5ce166928e0817d28e344456acff3d928b0def2d9bd8c0540c4
font_02_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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