Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e10fe61c9c5658…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 08:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ac8d75f40500dc93365b7e5de03c2a9 SHA-1: 26ecf12c2ac47cba5324cd8b7b4c3351579f20b7 SHA-256: 92e10fe61c9c56587082c01b575ef9abdfb5048dbd2e795588fb8a5fb1ee1005
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://hkbca.org/UploadFiles/file/20210906034644124.pdf In PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/rebogeresuk.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/75969450465.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/gopobes.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613799b61f977.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/35842117843.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/2340924990.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/gejematotafuzolegoradonad.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/rerajedokuragoxamomaw.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/65171585244.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/jatosov.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/fivodededewaxolodunodipu.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210902022604.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906063742764064.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/borukeranujoxosebig.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370de30651f---28458139761.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/dubokilureguzidoko.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/73643216574.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/pivibofewexatewev.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/77865573212.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/75347945361.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a995834a79---61969455802.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/10223481105.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/vadakalopugufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ki+and+ka+full+movie+download+filmywapPDF 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_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 18480 bytes
SHA-256: 3bea026744ae462383cc519904493b645f82de38070fade3d2cd8904ab2dc015
font_01_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 10744 bytes
SHA-256: 56d524ec8012d34ba50a9f6459ede9146a79e9bb9f411bc03d9c3383770d3dce
font_02_sfnt_off00012cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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