Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb8bc80b82e0016…

MALICIOUS

PDF

88.7 KB Created: 2021-09-17 18:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87324100d9d28103f99ac797f287d624 SHA-1: 6e442c43259255ad2cdc562dfee3451400567061 SHA-256: 2bb8bc80b82e00167d013231f429b0ef72b2adf0ccac5bae9075e7f48459960d
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a link farm and the use of UTM parameters further support this, as these are common tactics for SEO poisoning and driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smidgel.ru/uplcv?utm_term=latest+english+movies+watch+free PDF link annotation
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/83320094708.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/demiwinojiwiwipeboguz.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767b24aad4---nijipunezugafumosuwolap.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161322f88f2612---joladutezoxabukog.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/foxusaza.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gawubatusovovefufevojafax.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/29179025166.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/63817559069.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/54743459300.pdfIn PDF document text
    • http://huefpdf.org/upload/file/walapidug.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/99168701102.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136394d0f4bd---binoxegobadazopexubuziku.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/5860081706.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/xedebirugupixu.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///rokuruvijamotutidurupuzo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4c32660b00dd9dd208988e35987d198e/21906026545.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/81032161911.pdfIn PDF document text
    • http://cortabellanews.com/userimages/24725132000.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///30774682194.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/daponolikebapexa.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/busaguxusenag.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/bosuduj.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/momodiwevitilipim.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/34449584433.pdfIn PDF document text
    • https://internationallanguaIn macro / runtime command snippet
    • 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_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 17748 bytes
SHA-256: a034ce4c12fea58d337de8ab9a289bde7fa7032ca62173de71daf5c4eefda0d2
font_02_sfnt_off00013c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C00 10892 bytes
SHA-256: 43caf8bd03d56689e999b31a0b57a7254a5f17e566d03dec944a0bcebbc9164b

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