Malicious PDF — malware analysis report

Static analysis result for SHA-256 487798f7b4e58394…

MALICIOUS

PDF

138.5 KB Created: 2021-07-01 22:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 079cba920a98a6eb18ccf4faf150e8d4 SHA-1: 13caaa731d524602f793304bfd5fa5c2f718754e SHA-256: 487798f7b4e583941cde7f7b8dd2429a087d8e12d5758ee86f13553dfaa8b9f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and URL distribution align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://lasfyy.com/uploadfile/file/20210615001915033.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c573610d5b1---19649255736.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/vutemuxagel.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/musazigejowabaf.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6bf89fe67525d4ae49057ad7b3731253/17617026450.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8dbb7a031c80b0f2319572a14b54b8b9/52340478149.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/liguriwowelanuzelipu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/8tn92drotgmfsnmqbirr9jdhmu/63477060796.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/fidogiwog.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c40d68d0d57fdc98dc2fd2461e436f8/53074157594.pdfIn PDF document text
    • http://talleresjpg.es/img/file/43160319541.pdfIn PDF document text
    • https://people11people.gr/uploads/File/41566753350.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/85466219867.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/55265224593.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/bapegidotibukezaguku.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160713d006f9ce---pakujiroluro.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210622194135.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0138d39a---57510006080.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69634a1b93---85178066419.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/75d3e3dbc0c20501abd9a2ada4e6e01f/6390652444.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/47034900561.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b037f6a9891---vawegamena.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/nexas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=feminism+and+international+relationsPDF 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_off0001bfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFCA 17576 bytes
SHA-256: 025b5217b6f24fb5ded32167182d2bb65c46da901ba023090b1d9e4c14f3e8e0
font_01_sfnt_off0001ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECD2 10388 bytes
SHA-256: d04297dc3d52b431e8ace61cd0879f90f41c618fa8155e0b06d1321ad55a2ca0
font_02_sfnt_off00020440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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