Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a479d723ffa5453…

MALICIOUS

PDF

91.6 KB Created: 2021-06-12 05:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a88f27b939e783c25bcb0eb953255ff7 SHA-1: f51daa288997ea5460b492945fa75c13d397b825 SHA-256: 7a479d723ffa5453bee6e8bc46df21d8118adda6bc07d35072b3654ef931a727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://allytemp.ru/uplcv?utm_term=porn+comics+my+little+pony PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160841d686b54c---16455962822.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/lalitejulojomidalizax.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/palix.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7368da6ed3bc97c9d62b969d012dcddc/nivawoxebazuvupufimami.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4ef0be03b07795c3525905be00641fc1/netidozerezalinaxosu.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/ligukiporafar.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160892bdabb0f9---74056507819.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/d1bbf33ef12ebc035298516b4a7099e0/zewabuwutil.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/86c4df5fe755a0a0e7f8730a81835f36/sozemikapuned.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b42d4a07384305d51c548d0f6f7c51b5/dodavezuwazifisufajideno.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99d37dc3e---vitodoxudelononojopa.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/74946610132.pdfIn PDF document text
    • https://actor-conseil.com/files/file/47956678843.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59586fa6d---tepuvujelazijib.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e6fd36c9b08f03b56633aa85bd4aa785/48306372864.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0fh3h3kfpnasuvnm98pp8rb69b/95821791231.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/97206150441.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7cc985fbc5857b6ae21a554e16ade711/xewunibowuzanimanilef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 6424 bytes
SHA-256: 50759c40df67ec181331d37bc16259f4db20c39507a2c7d18444f96545433770
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 4972 bytes
SHA-256: b042467f263def107e0cf653b763793156fe2a3198238f5437b7643ec10b0e42
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 4496 bytes
SHA-256: c223fcd8da1a516391ef72ff92e9d82223cdf78d18794ab5999bc2642004d5ed
font_03_sfnt_off000121ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 11536 bytes
SHA-256: 0050d76684c6ecbd48febe2cd546ab66e369ee0667c7a2bec900e0fade8dbdcf
font_04_sfnt_off000148d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D9 16628 bytes
SHA-256: 0edaf20887b6fa97af11b68fb5a14423f5f53e9da2dc24dfa575a6c2b0090066

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