Malicious PDF — malware analysis report

Static analysis result for SHA-256 988414e95c695e68…

MALICIOUS

PDF

78.4 KB Created: 2021-10-13 10:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 396fd7d99f730d10728fb33762751290 SHA-1: 72f6fc5e3a0c30301b308aef4f592345ae8a70a4 SHA-256: 988414e95c695e68e9116aacb48e3fef36070aee12de5146f01683cee372460a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=i+have+not+received+my+driver+license+renewal+in+the+mail+yet PDF link annotation
    • https://ctsgroups.asia/images/file/xovetuxazo.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/63678043442.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/pozafivifubowerexozidaf.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/malomodevowarikidowanijal.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/5125468185.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/65237659667.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613cfd9ea646c.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/63821658911.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/55684708352.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/980778a23069171368bd6a19af854ef6/fubaxanududadufidexo.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/222535850.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407ea0aa453---febaf.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161645e305a661---sabewofuwomore.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/tugatowexikijaruwumomu.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/85180739335.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/94885907216.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/71624568557.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/21476771127.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/50137902355.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/465c2809c05d0d0c08e2c8cc73ac94f1/jinajufamopubebokav.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/vitepegewesekile.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/demumanufasof.pdfIn PDF document text
    • https://matricula.hssanesteban.cl/files/rerasujubogukefadubimi.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/girisazexutalo.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/30185416189.pdfIn PDF document text
    • https://lapdonline.org/file/38003768831.pdfIn 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://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_off0000ce35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 10852 bytes
SHA-256: 742f7b387479fd96f5d2b4d8ee8b6927198350d716e910ce05ec4ce949f0da96
font_01_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 17192 bytes
SHA-256: ef2df1f55e86a1db6b651f8bcdab44a4ab2cd24940fcc2a38afabd2a62855b15
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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