Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f77165287024fd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 04:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62109610bd4fb4da5c2df405d6cbffc5 SHA-1: a5d943a7c813db1c2045e063dcbda7c8a42aa92b SHA-256: f6f77165287024fd7691ad601f51cd60aa865c713a26047b9a3df94f07b00927
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and potentially malicious, including a high ML score and ClamAV detection as a phishing trojan. The presence of urgency and download button lures suggests a phishing or malware delivery attempt. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious workflow designed to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • 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
  • 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://barudan.hk/UploadFile/file/20210911184458031.pdf In PDF document text
    • http://alituncer.com/userfiles/file/figon.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/bitowuroxevorokovokixug.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/69877274497.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/tinovuvexogepaxakefanik.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/44196868480.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/85735562073.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/32f11950f063234fd1ff165d17722833/45128866584.pdfIn PDF document text
    • http://thongthien.vn/upload/files/14359343212.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/37272c13fefdfedaf013d9570d5d358c/lafavixol.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/3058479230.pdfIn PDF document text
    • http://glassick.com/userfiles/file/28375240324.pdfIn PDF document text
    • http://packturf.fr/files/89960005272.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/kaxisukunolofezam.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/dozosukojewogimemim.pdfIn PDF document text
    • http://samtle.net/ckupload/files/deluxagugivufejumivakopol.pdfIn PDF document text
    • https://sealskinz.ru/files/file/votolekibafem.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/7413226790.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/21918061555.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/nadovanikigizuloxojeruv.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/19841030392.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/wovurore.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/lekagexaludowinekep.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aab8ffae746fdd77cc73261d60169c70/51601418345.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109120643165836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+dark+knight+full+movie+in+movierulzPDF 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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 20072 bytes
SHA-256: 2220c1eea9541b1e6e8b172c07bbe9c3a3601e00eb6e627470c29a550f19169a
font_02_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 10916 bytes
SHA-256: 3fcee608b68f0e62ec001b7e7d84e6e41cd3769916636e3e92b796a3c69d1a1c

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