Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9d3296e9d2dc70…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 16:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb857b3fca19bf000c2e576985d5f09e SHA-1: 61c8f64a83f5140ac711607218e15a880a2b3b4b SHA-256: 4c9d3296e9d2dc702a0a218745235ef48fdebfdcf644134c196cc2bdfba17930
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/uplcv?utm_term=1+2+3+4+5+and+6 PDF link annotation
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e9bd7adccabc7d52b91c8c353b85c9e9/damigiwaxepu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/diwamuturebaxatogubipofi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcef4a1f1---dudogenasevivakomuw.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d634205777230ab0915b8ed26f6e7540/36425963629.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/49f93f38207de905f512be3e9c2ea018/30637511120.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/43895cff590aa8da751223b88f785562/renegiviwinupivu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1e235d8e7---sozonubamib.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/pososimikupajetitefareb.pdfIn PDF document text
    • http://sporyolu.com/resimler/files/gujijibazirexelejevosom.pdfIn PDF document text
    • http://carszana.com/image/upload/File/38167963142.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f3ac4bde5---gudiwupigojejiwifamedaki.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/ledunufutaxam.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d7fa2ed9b59808ae37c9c5f2ca88abb7/15413287370.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8132f92538---12366195679.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108172005519172.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fad117b58---88440453782.pdfIn PDF document text
    • http://huiking.cn/uploads/file/021905382477.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/35103032451.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/wowubolasanulov.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/xulomegolotirev.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/3104548311.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_off0000bdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB4 17688 bytes
SHA-256: 9fd5b7d71c930aef89df899819d4eefdd656f89c116568951b4a84d471c2d25c
font_01_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10112 bytes
SHA-256: 2f4347cf7ac97c4cc298fcff82ec01c1f4088fdfbcc425d599b1e0d916bacda3

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