Malicious PDF — malware analysis report

Static analysis result for SHA-256 078d42d73038be70…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 06:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78e0e4cc35bd77b0505746ed0875bfe7 SHA-1: 892f6235a3eb7fe3431ff82d6ed5a8e1059ee630 SHA-256: 078d42d73038be70889c2d76cc4147ed504fa548dd1ecb0b9294d8c8f1fec6c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on potentially compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aristosaigonhotel.com/uploads/files/8820680281.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143627c89eea---13525728253.pdfIn PDF document text
    • http://teraval.cz/res/file/migunuzoferaputoruribek.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/futolezagevalarufulaf.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/47806844351.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109132035085869.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/72609877596.pdfIn PDF document text
    • http://onlinevay.com/upload/files/70335488334.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/30cb64b2ed34b7971c66a40157810731/lolaranupijuk.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/47638034188.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f16d0e5515---mutubu.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/64235312526.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/39550074859.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/satowozimufiwezotulutiwez.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/33288120204.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/58733150960.pdfIn PDF document text
    • http://fourfoods.com/images/files/5154235940.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/18960263965.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/juxoz.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/sodimi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ee5407b655fd6265cf43668473f43a7e/nexitolo.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/76517329494.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vugofaj.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/xuxojoxekaruxexuwimoxi.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/91476171298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bet254+app+download+for+androidPDF 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_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 10796 bytes
SHA-256: 5a8ac89f85bf31debb5cee9d0f4dccd8685a9d0d44b00c7f1b5790bf6a58e30b
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 18700 bytes
SHA-256: 8cbd2821c3e5e6dc9d6b94e6fe41ca430abbe5175b48031d7e7a9ca18db07645
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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