Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b421975cca4e0a…

MALICIOUS

PDF

101.1 KB Created: 2021-09-07 10:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df624b3ca2aaee99cba8185b5e1c7611 SHA-1: c17fc1fe4c224f79e203be02f1758e0f19b0a371 SHA-256: d6b421975cca4e0a702989d3f4693abfd8857af6cfae42b075c27085e0fb28fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7769feea993560697b26c6bff3272a94/zomomofepete.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f772aeb4---80944518454.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/kedaribekifamedogedopife.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/febanitir.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/31503683841.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc70479b4---debukipimenasipirobokegil.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/metifipitijigewajilesep.pdfIn PDF document text
    • https://coevent.ru/upload/files/zofigot.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/66011061096.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/38517348021.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/tavabuwujuwuxuju.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/12838611788.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/fa9148744425e8c01106217a8b18f80e/buxixokasodilij.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f713f48378---96344183550.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/84707771657.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/fusugegadunow.pdfIn PDF document text
    • http://zzquansu.cn/d/files/98876051936.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/livivopugiwoxixiwogob.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/xukevekanojiboneboxola.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a95d6f6d5b4165d1ce3069b53fc92e85/jubefufozaputotafulume.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021080402524473499.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e26f58974b8a8244a5f3d614526655de/zutodekonavevadex.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/51979990981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=historia+de+la+administracion+libro+pdfPDF 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_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 19868 bytes
SHA-256: 66619385a90ae6dde4a33b1c040768eafc432eb7c7bfe08335398dcfea61506f
font_01_sfnt_off000153df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DF 10912 bytes
SHA-256: 80586d1054a762e99ecc4f9639e1fb6bab253ba5c40bd486b667df0f7d8135b5
font_02_sfnt_off00016cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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