Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8e0b92d7afa789…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 11:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f512f54f4dd6a97a6f4b0d5b460e6e7 SHA-1: 5343e1ecf5ad21616734e421ae9f268ffd625db3 SHA-256: 4b8e0b92d7afa789c6f1b9fe198d55badd664a99140b681e189d19ed198a72dd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 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://chcial.ru/uplcv?utm_term=get+my+wifi+password+android PDF link annotation
    • https://efckrakow.pl/userfiles/file/vonenatodunevomure.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/powajilujokerixaba.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/21269207499.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/jilegezazu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c607a953e---65761886192.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/wopekarutozeve.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/76645762359.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2m20hjlfb9dca87ajgbnullci4/kajefiwilu.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/lananovobapo.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/43505963922.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2rqt283qeo6oq5r6c8c1j7rdo2/85889127357.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/tugadovidemimisuluxon.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/33737636189.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/bevuvedoxezixi.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/sadojaseduzesowaf.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138058900182---72567766664.pdfIn PDF document text
    • http://ping-property.com/user_img/files/36560340771.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/76881612793.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/11058743586.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632617199.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/27190338280.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/kuranugemidi.pdfIn PDF document text
    • 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_off0000ad8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8F 10852 bytes
SHA-256: 250a8bda3bcdf4a8817db0ac752441404938075029b9469d0199c645f17e533a
font_01_sfnt_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 16348 bytes
SHA-256: 0b3ecb20edc1d81b46f12b21ae872af4c03050d7d27248b95557d8e7b197ac69
font_02_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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