Malicious PDF — malware analysis report

Static analysis result for SHA-256 de91101be33ff420…

MALICIOUS

PDF

537.0 KB Created: 2021-08-11 23:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 56ee7186b5eaacd5e97ff8cf8ec8fc33 SHA-1: 2cafa0e121f9f88cc817d2d6a5aa52b9ac64ebfd SHA-256: de91101be33ff420b2625b5fe65c3937e9549a8b81d3cb26a695b9f55fe509dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload storage, indicating a link farm used to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7772

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a407c798ea6---dadujafojakixasezizi.pdf In PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/58328921190.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/3ebf08a85a1c8c7e6ba03e1c7d08faa1/46887443398.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/56258799055.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/63dajbd9nogbpauidn0r2uhid0/pezopubakutuluninowojegi.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/10462750694.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/buvebeguvefawojesuwuwijim.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/582198953.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/zotizojipenexusulore.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a469e3945f4593ba71d24cab196586fa/panepawovi.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/parupebilikiko.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/nonuxiji.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/sarogqlaclf7bi060nchgc5tb3/tadupifigujusufofenanaxul.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/47824312509.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f073769420d---kuveje.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/naf9kln1deilr3r8ucj22lm22n/sarojarir.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/on5p10ubq931k61l61619cf0bq/moduligatexo.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/falen.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a6566ac9a---18947642083.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/26596866556.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/50578518114.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5be1d12390---pikoxepejodel.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/19280666e0e4ad6f8a1281c6552cafcd/1766249292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=digital+marketing+syllabus+2019+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_off0007ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC51 19668 bytes
SHA-256: 3180c7047d55d75c5563f0c5cc2a72e8a5d94f7dd23a496df1a8c57842b96516
font_01_sfnt_off00081f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F48 11836 bytes
SHA-256: 9044d0167893feb060ba284aeb585d78c2383a635121c03dbd492ad775720331
font_02_sfnt_off00083b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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