Malicious PDF — malware analysis report

Static analysis result for SHA-256 de99557eb9fd181a…

MALICIOUS

PDF

74.8 KB Created: 2021-10-03 21:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32b8b20194fb2b22286f56db11bb13c2 SHA-1: 865f6e57e1ebd3ea3aca6befd04377e88825fa90 SHA-256: de99557eb9fd181a791ca2973a9318d86966bef03beef95ff686cf620d94e18d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for obfuscating malicious redirects or initiating further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=tracee+ellis+ross+fashion+style PDF link annotation
    • https://cr2tek.com/userfiles/Proj_Name/files/lolunataf.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/76302177785.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xogopobatabuveguf.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/27697307922.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/pafiselixumelineximutabo.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/36564552047.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/67033804494.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/kiwasojanixufepuro.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613132050c18a---38943575089.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3a56f81726045b7f04908040522344bb/80860132683.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/sifelavazotu.pdfIn PDF document text
    • http://belloverde.net/emailer/file/salajizawupigodemu.pdfIn PDF document text
    • http://att-na.com/upload/setigufivukodabuzi.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xarabusobizabevifimu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qi5i851jf2crpa98kaflo8evli/65819406801.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/29618199370.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/83786252637.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/wuzorutumosuguxirune.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/jimunamol.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/regax.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/74447566941.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/tixepujono.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/rofebunojoduk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC619 10512 bytes
SHA-256: ec792876404bb60442ef78b61b24e111917c2ba8d9891870b596c048716f3bd3
font_02_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 15672 bytes
SHA-256: e35a63855cc150a37bd271aae606465ef2cae16f956eb508f9ad7a07cd7de706

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