Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d4ae8b0f3aa50b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-07 05:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b0e14a32f80ff4d5585e762b8ee3c83 SHA-1: c61c176bce809270dcec3dadf10d8000e3115b29 SHA-256: 74d4ae8b0f3aa50bf84d3e1aa321d1420fd44043618f311d4cfcf224a67cdbde
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4fa6fc87---jolowexiximilikavaz.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b91771ecceb3772545cde4cacb0e0c3/88276693773.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/75452535419.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/tufib.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fq6glm9pia7fvis406ml8homp2/rumafevigifozebos.pdfIn PDF document text
    • https://aspirans.com/files/file/zijivipebadi.pdfIn PDF document text
    • https://aashianarealty.com/file/45296738193.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613683235e37a---pakekepi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/47325dece6255f7d0efba51cf8d33177/3888231674.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e14260db---mufatorum.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ad3754ca825862a96cc85610609c49b0/71325625502.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/363kaaokft9olvag6ecd0srjls/70398200041.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/71963917991.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/wowemoz.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6496a861c---sogij.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/kokugisoxigedewifawomadag.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/068ca6ad59af59d684afc626a72bacb8/zakevowunos.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/subodakakufavivisamazo.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/46422227521.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/60399658699.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a3f2750a0596beca0892ece252cf3a0a/tupeligivad.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/rifodufakifarikovisikix.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/99d0dd52250ed51665cd58e55d024abd/gakexofaxetaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+mathnawi+of+jalaluddin+rumi+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EA 10872 bytes
SHA-256: 4a64bbd1109bbc30ddd51b4fc8789003ffd4069710c472d147c8b509616daa27
font_01_sfnt_off0000cecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 16556 bytes
SHA-256: 74b93a41f8fa85a2c666958e1447ef9b03e7417ea9ba8a1273dc1947c8c2b2da
font_02_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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