Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ecdd1d01f29b56…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 12:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d3debc45380f1b54066e8151235da51 SHA-1: cd295146890f53e75a5ef97dc525ec71b8f3da9e SHA-256: 23ecdd1d01f29b564c4fc8d7495116f5d46fb91fbdbd8f49159572b3e28bc9ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS upload directories. The presence of 'utm_term=hack+snapchat+without+password' in one URL suggests a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://karapinarinsaat.net/userfiles/upload/file/ralawuxigu.pdf In PDF document text
    • https://bahceneryaman.net/public/content-images/files/tojexetafutepok.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a68eb0ab8bd---83471829126.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8oji8rgg9lku0aio5urvekuq51/xuwezezobifogapewubavu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/35725161316.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b76f83947---30971694388.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fcb9de2081a548929734ca1d36c12c54/80515371231.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4ca52ae6---jikalunazodisajivenaluwo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f2e17d0e---betisapedat.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64ffcb408f3ba0561b890934e2f33472/xazalawigipewuw.pdfIn PDF document text
    • https://artbynela.com/uploads/file/zitol.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/27483287237.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0076d99c25e83a5063e1a26687b62761/fofive.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/9755686629.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ed72513d0a86613e0c1d9e9e549ace24/95688636913.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160abe8194ec6b---tadiratomupadufon.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7020039f74982244a142c33151cd0c98/mogaseteguxomavobu.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/99565587696.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/dawopo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zubipodofebimidegamo.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/36773781782.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d0d9e4606cf45b6acd9dc9cb89a66f70/gobon.pdfIn PDF document text
    • http://ned.ru/uploads/files/50371416817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hack+snapchat+without+passwordPDF 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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 17516 bytes
SHA-256: 8e5689163797e979ee3b1a71b51e81d5d449f9cd831711b1b72518d6d9f8c5b1
font_02_sfnt_off000132fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FD 10700 bytes
SHA-256: 0f553a14a4b2ee18ef179cf120084d23ecb235af8606f1a7ae6e41ee2757f595

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