Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dba76023c15b25f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 07:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32bae5f85208a7678052666a0f3368b1 SHA-1: 03189cd833d2e8f1c628aa5e71433339bd2302e2 SHA-256: 7dba76023c15b25f0142fedbd9325490c2c8651d3e7d74180dcf184d9adb6745
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious intent, including being flagged by a machine learning classifier and ClamAV as a phishing trojan. It functions as a link farm, directing users to various URLs, some of which are hosted on compromised CMS platforms or disposable domains. The presence of a 'password-protected archive' lure suggests an attempt to conceal a malicious payload, likely downloaded via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=gta+sa+lite+data PDF link annotation
    • http://chpcentre.com/files/file/36980102101.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/94407964433.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/karifov.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/28233305983.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/77369909107.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210917_110119.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/3svtfqspbec2bhkq4e18ttcmdo/11213711863.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/sagibomijewexiluleguvudoj.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137d53143ad3---82589351837.pdfIn macro / runtime command snippet
    • http://mestan.by/images/file/87900317865.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/7080191629.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/38814498282.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/lezereromozevodawepiluzag.pdfIn PDF document text
    • https://aaaxxion.info/images/file/33053116560.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/70415207984.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/74834201541.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/winozemowimiro.pdfIn PDF document text
    • http://nktrading.qa/file/files/51301738733.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/luxiz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9f5119ae---wogatazuguwazegobavigusuf.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/dekupimivikak.pdfIn PDF document text
    • https://ibericadearmerias.com/file/9857035704.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/12139604883.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/sagIn 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_off0000c767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC767 17144 bytes
SHA-256: ec91ce10759b79100b6ca4de666669c0dfe059efa35d2c164508d14aa59ed1ef
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 9956 bytes
SHA-256: d4552da710de4642bb40201c6643729c784d09a0cef7317842eb69ab8069deee
font_02_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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