Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e31abc1c24bff49…

MALICIOUS

PDF

83.9 KB Created: 2021-08-14 03:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 178f5e8d0a32dc41690bb34287272f52 SHA-1: 26cc99e1a661cbcc899bc7141cebf19172ec0269 SHA-256: 4e31abc1c24bff49c3d16b23d9b239f219c01fccbac32ed1d12251ba3cdbbaff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1070.004 Indicator Removal: File Deletion

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high score for password-protected archive lures. The file contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised CMS uploads. The primary attack pattern involves tricking the user into believing they need a password to access content, which is a common method to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://qkon.ca/images/file/59390898234.pdf In PDF document text
    • http://tradeweb.es/userfiles/file/mepodegoduvamosifig.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097d9768f4ee---38890092897.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdd3bb572---pevuwamifesokoj.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/zoxufeneti.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098831fbd792---7915731818.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/71130414886.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/linabugatijobit.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/fc210931b50ea06379f2a0337ed0ef82/fekazozudozufibidibusuxik.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1359d330a---12662659170.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/11536831694.pdfIn PDF document text
    • http://hmed.vn/upload/files/34311814755.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/49295984157.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2df5d4dd0---xurevifewewanem.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/35060727274.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890eed308ec---55620879120.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161100868ce276---99725866860.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/41461535364.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210803_9DA99422F2597B81.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/numuwazedusarak.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/32610267998.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/b610ea2aa7fc080e42c7a80af3de67ee/tisefopubewawuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kalender+2021+cdr+x7PDF 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_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 17064 bytes
SHA-256: 939f5d5b12acf5a1482d418d000820f572f26a8063da6c7914ecc9ba0f43c04b
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 10320 bytes
SHA-256: fa9f01827d158fe79d70436f7d9fa7d2e162b2417620fd0a5d1df8a9375860b2

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