Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1f773f3bc87a51…

MALICIOUS

PDF

90.3 KB Created: 2021-07-16 04:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 403dc4104e750e9ba5eb5d3ce3441643 SHA-1: 87226db861bfd00bc166e6ce373c08e867a3f18c SHA-256: 1f1f773f3bc87a513c0f7b58845770fc9504de622e74a20a1322e456799a9a48
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line interface, a common technique to bypass initial security checks and execute further malicious code. The numerous embedded URLs, many pointing to compromised CMS uploads, suggest a link farm designed to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://dwhs79.com/clients/15834/File/17483564691.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160776730e03fb---50929650828.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a872eaa7c5---xobakaxa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/66a1cbddbefb3552c9f5d61ebdb4beef/56718413205.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab777be5ee0---vilowinepibuvo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607062dac5cf9.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/baralamafapu.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b367646f3f1bbfe311642dccfed097e1/83401282335.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf9b59558---kusuwi.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q15elehi9fh4o6dgaa62nji485/jenorepofiti.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5a0782495f656c4861edb6aa44bfb060/ranamotuwinozikek.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/149cddd1f72aa4cc8f479d3729b4bbc3/bizoxiwoluxobifobokesur.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b81df117c---95746778869.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/29799846641.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075b47bbb4a5---jodadatunupa.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/50905504.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/544c3510ef47d1ff2b192fb57c1de209/mavefebulapizupoluruxivo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda3396c34---viguporufosetilim.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079eba65ded3---5695261117.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/99711697815.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/mobizeje.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/fexopi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73342d7c0---wadofagojelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+software+for+scanning+documentsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 16676 bytes
SHA-256: 0b5eddd968185017eb2927802d051ca85d561587bcca822d0ef2f5d75456aa57
font_01_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001425b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 11012 bytes
SHA-256: 08d58e99dd783c11defc9e3e4784830d45b63252b7fd644920745ae02a7d83c0

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