Malicious PDF — malware analysis report

Static analysis result for SHA-256 157fdfd6de3f9e70…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 06:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa6dbbcbd46ed18da4a9a1b6fbc19ffd SHA-1: a830070fb6999343ab3140b98ea81125e57e98ac SHA-256: 157fdfd6de3f9e708ca94dfbf7ae8a40c14368d32e899f375b42c319ec9b1749
194 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6220

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3b454ed67fe0a515a5c6453e5521e0d6/18850933003.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b207e348ec---gokonirulufize.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/2288848658.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cca2ab0273d---xajevazotewuvokiguf.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/sanivupadi.pdfIn PDF document text
    • https://anfauglir.com/images/file/78770717341.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835e300d63---segijalugukofajajejan.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/88a6da45ec77adacc128d5311f1a6818/waziw.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/4179220480.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/suwaponenuxegonuwi.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c66dbbb315a9507ebd5b8242e4df9842/55763986878.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e004723a6f329be0383d571153711a43/mikopamurarisigufuparasa.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/nirexujuwasupo.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/53163756792.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/jilukobuxomulamag.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/gusewoxupa.pdfIn PDF document text
    • http://fnathservices.com/upload/file/benuruvupafuroguvu.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/muwazotizone.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c78eea5e12---60647375797.pdfIn PDF document text
    • https://tarsiman.ee/files/file/34064929457.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/19561424626.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97651a4fd1---fizijapexitowuvod.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074320da27af---zamogoxuliruguxawopikogav.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d3f891d5e---mimijiwuzudimit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=special+warranty+of+titlePDF link annotation
    • 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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 10580 bytes
SHA-256: 7fcb5c69509bf4f572fb302cb3a6d8bc9baf3004154dfbac13826204a834030b
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 17380 bytes
SHA-256: 4a67eb9adf4bc003f6fdb44c6368a1b3cf45ae4c6baa0c703660503aeb048820

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