Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e85a0155e2fcac3…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 19:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed08adcfb924e368d4e9427f50356b32 SHA-1: 3fdf8efc4f98443a33ecb9d4ddcfbfc67221c282 SHA-256: 6e85a0155e2fcac38ff9895c42a4bcb232f23abca97249d3d785d0bb63d278ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, including one identified as compromised WordPress upload storage, suggesting an attempt to host or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

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://calisnt.com/uploads/files/modedif.pdf In PDF document text
    • http://nbmounts.com/userfiles/file/1631495062.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/nubesudesar.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/joxugaturamagezusurur.pdfIn PDF document text
    • https://okazionche.com/files/34986444322.pdfIn PDF document text
    • http://signauction.net/userfiles/file/kufakexukaravebiwil.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/71875113931.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/barifonironineme.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8fd5904b---nirarazati.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161387a562999a---29394149610.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/vadogarigenuvubexikut.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/ruxexaxesurixifima.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/fuvovu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b9ad2871441375c6c51df8c654d33ba5/45267200853.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/83959760459.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a41f689e1---tikoketesagovesijodigib.pdfIn PDF document text
    • https://southafricapools.com/contents/files/99088826873.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/figororazore.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/85662691836.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/45173871246.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/miwusuvuvewikexerumemawaj.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/pudat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+games+for+4+year+oldsPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/tubibosopozedodalikekig.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_off0000bd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD63 10772 bytes
SHA-256: 8a6917ce7b69ea043b712ec2a7a4ca804a19affe9b0e12eaa2d431fe5db3ff22
font_01_sfnt_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 16352 bytes
SHA-256: 5a1dcb2c83f5c8661583c750a3e3627578b516a9e89507a726d94bf44e382df9
font_02_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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