Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc2dab302209430…

MALICIOUS

PDF

83.7 KB Created: 2021-07-22 16:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4ccdf5c9c07d5158ae6fba9e157a0719 SHA-1: 6714ba211549dfa461fd9e7b28b60131a82919ce SHA-256: ecc2dab302209430485280b3444cc66439cb2ab1d9cdee2317a87924328274fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://thucphamtruongxanh.com/Upload/files/jazusidixore.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160730ef70cf47---41691534191.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/92547892932.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8f3c073212be1a75f672a5167a5025c/64115546814.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/d46029a86aca975e441dfa2ed676f8c7/56217290334.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80df2cd25---xulumogedaxiko.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/jofegozewelomumasutesorut.pdfIn PDF document text
    • http://aimic.com/userfiles/file/79526123482.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f94cf8ab9f6---texepulezaninizepizab.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/70804326371.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaf6a692dc---luxunoluwi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qbinummv865l3tcroe3fsrmgr7/luwudun.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xowuwenevimosaxupuzoze.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fc8731a25---banazawuletulokexubad.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607670c611f61---81888121928.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/971b4f68c245a9e91c16ff096809dfdc/24894790946.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/au7romfc5qr8f1bkglpd6iqq8h/kadajije.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/saxis.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e8gjedjurothqsv0ehfal7lkn3/70880531271.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854461065db---2198996740.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/87854257210.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/9588708669.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d107143ad---filiwivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=neither+do+i+in+a+sentencePDF 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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 17240 bytes
SHA-256: aa9c51698fa8f0e4eb03d5b331c8e65c09de573098ed538b2783030d3498d655
font_01_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 10400 bytes
SHA-256: d1d317697191dc29ba3e9e7fd74d4d81ab880335523e367dee6f2306d8783e41

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