Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5dc4f14d5f4d27…

MALICIOUS

PDF

82.5 KB Created: 2021-08-15 13:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1649de9dab6a94f0eb62af7dcfdcb5e8 SHA-1: 093d0acd258a43e84026bbe14af735344b3130fe SHA-256: ce5dc4f14d5f4d278e8ac659146fd47fa67c92a79efab292c1b034fb0bf7b69c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links on compromised infrastructure strongly indicates a phishing or redirection attack.

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/e0f4mqufrp5f5o4uc9lpgf5bu6/nofisu.pdf In PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1a94bddf8b812078ad128b74e162b47c/livujasepoberi.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/tonajokagugitapomolit.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/83482258034.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/415d866158321ae4c053ff8bdbd63daa/govemanuxekutenozegoziz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4371af40---94433729320.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3afd5ee00---diwukusuwatukudebe.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/vebadajevogenowaxuxuxaj.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3786d26a04cad6a0e39c4d7d5ed7a728/59930773921.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3e3a2a58---gatatewiger.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f68806aac---61971039109.pdfIn PDF document text
    • https://alutat.com/data/file/midul.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/62409831604.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/84dd689f5b22c76c2029276489cd1117/tifaxabi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4uql6d5amk6c0iuoqdcl6o9dgc/xefusijosobiditivaketojuk.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/vojufixumumezenutuliw.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1415a8d94---37122528596.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/57435171750.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a53997bb---76043361667.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/81857809910.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/gagorowegifanujijajemovis.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26602ddfd---2149798308.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/4d4e8a9c842b702f8b404b320c70ede6/supakajabafoxixegev.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbfa56d7f1---wogarapedukev.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cab9a593ea---wufarawizutoli.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/92299275325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+girl+voice+changerPDF 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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 16856 bytes
SHA-256: 76028ecfd50a873c44d4e43f6d51bab580419d3d0d0d6ab16c4a22d909d57906
font_01_sfnt_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 10624 bytes
SHA-256: 38d91ca04202e29c52b9dddc1ee3a63ae27783474a9fdfece5e88109265c86a3
font_02_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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