Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecceaf9284b1f691…

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 15:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b50cd5c172711b44b3221545ccad649d SHA-1: 76e317c3ff4299e1b98db51e491bdb4a91f8278e SHA-256: ecceaf9284b1f69176336f5261228df6f1efb471ad406c442c3f7df32640bd91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://platypusspot.org/uploads/ckfinder/userfiles/files/bubugejofixetikodebasug.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f5758f1844c---ronovisaxasapalajasumo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c75172202---tavuwojuvabobozilu.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/tufegebelebidalujawon.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/93073705687.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/52699116863.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/82437918303.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2a2c95998197c21924ce09c31dd702db/63888101397.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613249e1a3e20---salax.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/36038338814.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/o79873d7keoo141knsamqvbvn3/xapupan.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/5290455808.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/padojivenap.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2ea010756dee3a5856881096de792332/pawetotejadolutev.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085adcacdb2a---tilokutobugizibibaket.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/balezevenuduk.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/biviwugagabusilaledizeme.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/tozekejovijato.pdfIn PDF document text
    • http://freetds.net/userfiles/file/9285401486.pdfIn PDF document text
    • http://splogservice.ru/content/file/lolikobukukago.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/mifawa.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/xivasezowugubedemobatiwe.pdfIn PDF document text
    • http://yuha.be/_files/file/44667541435.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/21874813449.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/67692629107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rhyming+words+pdf+downloadPDF 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_off0000b7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B3 14812 bytes
SHA-256: 9b7692dbb214068b25a51c1618cba2cce9f9c869692c091a802a93223a2de166
font_01_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 10960 bytes
SHA-256: f2a58b58b9700eb8469668a71a38cb687bf8fdc7d07eeaccd2e5f49cf4176417
font_02_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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