Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1cc525e0555b7a…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 19:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f3a0724b6db7add7169489899fc1c18 SHA-1: 5c0e3070dc204c0f9c8dd5bf5c547a8427064ec2 SHA-256: 1d1cc525e0555b7a590415b1d99c2879b75f709e333ca1a742a7e3c9f758a318
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable, but the presence of numerous links on potentially compromised sites indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b1e5f34070db783718b346f932f23683/2477552490.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dc04d9267---ripizokuwotuxedemok.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a111e88d2f0---watimelipud.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/68885579125b4f186e12051016889882/54420197949.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/0be822e3437fe071e1c8da09b43f3577/3201495828.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/145c83dbb67828af6e8bd3d686c96822/56632919606.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5de2eb7e88---sanogatitadezejuzof.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/96475308804.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/zajewigu.pdfIn PDF document text
    • http://learningkey.org/userfiles/826699027.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/oqad4cb8idmoh80l7ca3kvg7k7/kijibadigowa.pdfIn PDF document text
    • http://vinmexindia.com/uploads/xepegegon.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/ruligosonaminimo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/60258196944.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/urkphhc70sakker8u00bfoorr6/zotixanuxetala.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/ff071e3c84d2247c9c232770a7b597ad/1156067323.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc987be449d---62997718745.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/f6ur16vcs47d0olj5etm07d00m/33320670116.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210603_154950.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607123c19da28---70067937112.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/13598339438.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/79180ad3c1740b7728cac9e36edf065a/48122001353.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pujixazabinuwazix.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ho4g13qhrv2cubns954gabni63/sedan.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/39522055861.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/vimexosinubotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+to+do+after+pulling+a+musclePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/38710200579.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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 11160 bytes
SHA-256: bc35e15bb2adb1ec27136d0f082001ff687c20c4970c7e9a3837c8b0ef17070c
font_01_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 16040 bytes
SHA-256: ff1fbe47eee84f9d1cfc749200fb2126c315c315eefa5de33325f5fda025f69e