Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54418c4ed36aa08…

MALICIOUS

PDF

91.9 KB Created: 2021-08-10 07:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d01a8855fd7fbb5ac7000e45fe3f4668 SHA-1: d36d348d43997f74b1330b4cd2b29b5e5c59ef9d SHA-256: e54418c4ed36aa081d58657cebdaf93aa3535aa754d869b8c0eb9ef9fc639c64
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the document acting as a link farm, directing users to compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ff0807ef---rilosuw.pdf In PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/81392229019.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xarepezalakokorifonemav.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/73199165146.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/55340148128.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098138be72fc---kakigekapusuwijapawitore.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3b722441ad98cc76c39fb33ec6ead5e7/bekabivig.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/64386531132.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40dead0bd---66420084445.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/36149721742.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080667b13e19---72327966724.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609404911a0db---kunasavefuzuxapes.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/03882fd4f0f6925ebf83a5e3ebbc7c37/pogogobegoradebijijatub.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9c528f5e98d3b9df116a4eed197672e8/97053041542.pdfIn PDF document text
    • http://canoeing.by/pics/files/bedebalulobazebofego.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/97609444961.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4f2ac58e76a58f287525b8aa6caefaad/74042023261.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/nipinerepapa.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b16e64882---88231516755.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/xisokotefitimubefazo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cafc703def---61988048128.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074fbc61d442---bowigetisolisaj.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bkvpval6ui9ru2u3er8hgdg6n6/88283565953.pdfIn PDF document text
    • https://isosklo.cz/uploads/vilivoguwagazeloxeliteka.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/mumikekexulivafofabif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+positive+negative+and+neutral+personality+traitsPDF 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_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 17636 bytes
SHA-256: 7c3d1208786079ccd497a18712785eda0d33d676a2e5f4ad3f360b27127ca0fb
font_02_sfnt_off00014704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14704 10908 bytes
SHA-256: ddd452fb6686c94a82978adf62911907f58102b89d2cf4dd349af656f37164cb