Malicious PDF — malware analysis report

Static analysis result for SHA-256 954e0361f82731a0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 11:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28599eda232f116291b451c05a2065a7 SHA-1: ac83d07b67b0b34a4de980c38cdcb163c6a28dbc SHA-256: 954e0361f82731a02b2162bfc8d536f9467d3de0747bca8e4e3ab3c213e2f4e9
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=il+classicismo+musicale+scuola+media+pdf PDF link annotation
    • http://kasintorn.com/images/upload/files/judaxefepipuxapezunisomal.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/40007768452.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/56600b58ff4048ae49dd6aa76aa6d1d4/fivokoxabiko.pdfIn PDF document text
    • https://mar3ol.com/Files/files/60379889458.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/fajutedewiwuzibujufaxe.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r4j6vg6efgsc4agrah5mokqonn/64931741642.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/widekekarefunepur.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/64291549945.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/nazimizafisupi.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/wowijikakexavajulod.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6s343pr4dk4lt6eu2eabo26jh4/15878677714.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160911be84e921---43445011978.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc311304cd---gibovato.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/nobenipopidilefar.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/17896615142.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/63a91ec7dbdd63d57fd3a017ea165119/14491878008.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/bofuzulute.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0d809fe1---21136536459.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f989e25a---33314704489.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kv9vaso369633fnvn54eu1mpi1/24998783101.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b65a5d23900cbad4cbd434a1603c0a79/rufumogedizarorurodomaw.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1d7689bbdd9e7c38f4d0bb43df4d142d/vodanuja.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0acaa9b8c---54106817048.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607755c7bd8f9---tojifomewa.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b094d87bfe324a20292dd88a3edeba82/nerox.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_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10528 bytes
SHA-256: f8e4ea8366aa8bc9d7cd333395705e31108b6b3c9d809529d58273baaa396e8e
font_01_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 17984 bytes
SHA-256: 46b55624f8bbb1fb5e454d1f7f07fb141128e67e2967a8491ccf6b20171be554
font_02_sfnt_off00013584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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