Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829aacfd1e111ae…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 09:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3397ce47579f339f9d09bf21bf82117c SHA-1: 787067b10166d9df83b6aacabd8d132c0754debc SHA-256: e829aacfd1e111ae5ff8b3ffb18fb49734a8abcfff7470a4c4d978c526e7c0c6
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple unknown domains hosted on potentially compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408f6011ac6---2003162983.pdf In PDF document text
    • http://betonkeritesek.eu/Content/files/55726631342.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/gewev.pdfIn PDF document text
    • http://leton.pl/userfiles/file/xejojup.pdfIn PDF document text
    • http://glassick.com/userfiles/file/15757391869.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/48nac53k22oj1q6528ph3h55te/mirekopitewip.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/50282169353.pdfIn PDF document text
    • http://protok.pro/upload/files/45568664606.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/32249904397.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/majomarin.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/jozaduzi.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/biwegusu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbdc37879---lamovesevuvijuzugiva.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/12302741785.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a74a3ec3fcb94f99bf57cca607bbf412/91626752308.pdfIn PDF document text
    • http://chayka-svg.ru/files/pekadowifuvugulezoxuwodam.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/99543625957.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/tamulujafegixatizi.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/mametad.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/43702411870.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/suxob.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fokabubiluxetutexifegig.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/dekujegojibojemamikijepap.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/litumebogo.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/zedim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=stream+team+tv+firestickPDF 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_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 10460 bytes
SHA-256: 0e5032d1c1c01c7b0682450e2fa83f71ccafce3a942aad7fd0665c3d41354317
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 17768 bytes
SHA-256: 1c451ae6b7c15d5c274f0548a0d068caac46af617548ced078bec12fff15a3ef

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