Malicious PDF — malware analysis report

Static analysis result for SHA-256 70162d56d90f7dda…

MALICIOUS

PDF

101.6 KB Created: 2021-09-03 07:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97e025d4c910d9b56a87b73cd14ebd3d SHA-1: 1514381295807b907a55e4593825c2f320b102fd SHA-256: 70162d56d90f7dda658e9d6ec10dde7e855f5f5ef37e1a683df95e65ac14f13c
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 CMS upload storage, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://www.climatisur.com/ckfinder/userfiles/files/76319501357.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/11227816826.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aee2ebc3249---vodipapefugapidel.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f32350d44---45071311739.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b38790834fefec990035d5ad6b6f17db/31486020575.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dfa38b95b---biduxaravilirosa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160743c9e9567f---97751367519.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ecb4bffbf---bilejupet.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/105000919261257abd46e32.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ba72106fa---gupevipoxupasupakitove.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5844ae12---20672816105.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/82094041437.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160eddd82500ac---94612507824.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9edbef0675881aaf42ed2e32deb8332d/benaniguwigotili.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/20287728652.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/nofuforifivoditaxogifit.pdfIn PDF document text
    • http://ipublicity.cz/data/file/pilikekamasilonuvupuf.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/dedevunuke.pdfIn PDF document text
    • http://vodnik48.ru/content/file/56429528361.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/90462022492.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7h957m57esdpnalt85mtevdkuo/33150252063.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/wotoretikotod.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/12163362231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=numbers+in+french+1-1000+pdfPDF 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_off000124f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 19564 bytes
SHA-256: 43348bc9201f51981b0799d3da3191f2d0cc36e5e4a9566b3d99ccf7d2512be0
font_01_sfnt_off0001581e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581E 10884 bytes
SHA-256: cec6ef18ca447f7c6d6374581f1df63af5a85be307b68dba0543d39926a5ef92
font_02_sfnt_off000170e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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