Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95f63146328da81…

MALICIOUS

PDF

120.5 KB Created: 2021-05-28 15:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0a4c7cdc7ebe958872e4273b74257b07 SHA-1: 13d8640c2c690c5647cb14406f06e4f1ccf64a67 SHA-256: b95f63146328da8192a55e95752ebdf28b25dffe16a02f389fcdbfcfa17cab35
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ebooksweb.net/files/file/fabanujesoluvegaj.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c053185c70---wikus.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/04be6f7cf6f493aab3ea1aa4bf5c4d33/7047596126.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef5f2873f---xodabozor.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e2f79594---rubesalaraxar.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kv8bglkfakui9bv9peajm3ut32/retegobifideti.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7514858d71986e24d439a61ee35d2301/jomixewekezenunej.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/kegifi.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/moxunovozobe.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706a0208df2---97961529148.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/29726a4b784e12de267ce2f881fba066/tiloxavusewisopalak.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/tusenikuwilis.pdfIn PDF document text
    • https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2883ba28---laminerojexilosuxeti.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xozejazaxos.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/jiwirozidida.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9b976b8f---32106342136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wilhelm+reich+character+analysis+pdfPDF link annotation
    • https://doi.org/10In 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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18597 5508 bytes
SHA-256: de7551b663ecb53ddb932fe4556f6c089e213f37f689fcdbac6c953f42dd792d
font_01_sfnt_off00019838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19838 11312 bytes
SHA-256: d59d66efdb5f4eb4e4a9706f951d3d77d9bbf8124ea74fac5f4a29b7fa9dbfed
font_02_sfnt_off0001be9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE9C 16232 bytes
SHA-256: bdc21286594a69dc0968ca5bd99613de364be0f673e07e33298ba5ff8abf051c