Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ea333d5f163e65…

MALICIOUS

PDF

111.2 KB Created: 2021-07-16 20:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4490c067608ff245112486877c7192b1 SHA-1: aa511e5bb5901f69af688bfeba919ab9bd2c40ac SHA-256: c5ea333d5f163e6573199cd805317a42146c5d74bb5abe9db9bce28b8697775d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://clairvoyantinfotech.com/demo/images/98310450576.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798f4cb0bfd---xutiwikugizamos.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/61276295917.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/66178869670.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5q247mom4btsd5eite5k3747a1/dejejogisefag.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c369837f3b8---7602692915.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/rujexugubiwovenegolara.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/42332278634.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/84c34197c73d3335983f9b4062c29ccb/nutivupe.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/sudepuxupugetuwudib.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/750c1355b036e3615f7accc3d489e229/kewogajawuzatew.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210628025804.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/68440311758.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/1518484389.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/zelorefukisavumi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/8420483179.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/37610325507.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f872aaf402---48371940812.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/13924330563.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/93569325303.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd588168625---99915273930.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/kogesuvivokuwosa.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d11dbafbeeda499964a1f46ebfa41a39/89774201955.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/40027255874.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09fbfde106---watirusutebuxov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=foundations+of+early+childhood+education+6th+edition+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_off000150ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000168bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168BF 17136 bytes
SHA-256: 083eb51552a94bf41faef510505b03ae9c8f040d3ada3a625fc182982836e0b0
font_02_sfnt_off00019553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19553 11076 bytes
SHA-256: 2063d43637f934ac4a6ce8db696a5bd077b8ffaf84eace5db2e5fb3e92c9b46f