Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b856430220639c3…

MALICIOUS

PDF

79.9 KB Created: 2021-07-08 00:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6db708b05fe792968c19f0c216fa8814 SHA-1: e36ea03d604036c65623de283816ab88c12f6dff SHA-256: 1b856430220639c3a4349df53aabbb4d215e77f353d9cf68e90e9fedf1117f20
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress sites and disposable hosting, likely intended to trick users into downloading a password-protected archive. The document's structure and embedded links suggest an attempt to deliver a second-stage payload, potentially via JavaScript, although no specific script content was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lenaoyunlar.com/calisma2/files/uploads/59449176868.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2358e3dd---sukularepu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160877eae3e572---menusibizujumowikimijinab.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/defaa59687dc5f71c5a3cdf04f63c110/67286588604.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/lixorufa.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc7c18392a---tuzidugesizegoxuvem.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/15152694795.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/44196737161.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/96298865703.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/6q1r1969chshm2t33b10a9qfk6/risirizib.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c0dcc1c51fff66106ccd5c8172b03e17/xedubamifesi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01fb40ad1---18568261368.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/db9b5bd01e423325955afbd02a7fca1a/gemarodaze.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512075453906.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/bivuxezutib.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/nitedudusivovofa.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609158acc51c7---6097261687.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/1571820729.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f03b2528125ee509805f5f2df4958c81/kujalizazafogegu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vsqaonigtf3r5chsajj0r063d4/fodiramidakosex.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/231ca9d16a8e92d0c40bdc5f550204da/fulesuk.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098511f598da---burizelowefiborilewozodux.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ff56a72839e1ff4d02861bbad4731b24/zusigifew.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/67105150086.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/23609000583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=beginning+php+laravel+step+to+step+approach+to+building+an+inventory+app+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_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 17488 bytes
SHA-256: 17a566f1188c6ae74cbd52404297300af10d487f288faba3f5dbcb9c58434ec8
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 11372 bytes
SHA-256: 52c803f596e2795471f1c60cc904c8b808cfca0a1787ac1f7d0896cbddf7b164
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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