Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e312b5219a1a651…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 16:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf96989338ab13d8d4d3c6a46e39c13d SHA-1: ff07c6cf6136053846a03850cf6202d04ccee5cd SHA-256: 8e312b5219a1a651b832f32a3a1086a3f776b36e3b5d15c0ddec2004f4bc7c9e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the 'Password-protected archive handoff' heuristic and numerous links to potentially compromised websites. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. While no scripts were extracted, the document's structure and linked URLs suggest an attempt to trick the user into downloading a malicious payload, likely disguised as a legitimate file requiring a password provided separately.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05815f112---43373319333.pdf In PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/97993900466.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2ba1e108245f119c5a21945631eebb9/32489945724.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6dq3p0cl35jk2ejb718brhpi82/89751067558.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/buronodeguveguxajamutuz.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/muluzo.pdfIn PDF document text
    • http://toptenstudy.com/upload/files/BodyFile__6108914F3DC8E.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a5ab1adff---vasamobikedibuf.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/38393535755.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/segadige.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/69386095987.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8i566oo1bbur5pskdhc6u7d48r/66786653433.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/pazipugixeboxug.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/lajinoros.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/kagilituvu.pdfIn PDF document text
    • http://findplusltd.com/file/77952725830.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/41710277154.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/perulepojirafaroburavem.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/84kal4o4nouo6brje94643e716/metedovisawajadome.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/91363486338.pdfIn PDF document text
    • http://zuche0551.com/upload/file/nuguxaruwirexusir.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/44764813362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rrb+ranchi+group+d+admit+card+2018+download+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_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 11640 bytes
SHA-256: 116ab5e51495c261e111098ba16c207a07996ba02fad2494d93cd1bf39ec7374
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 18388 bytes
SHA-256: efacebba3ec584df9a0ccdbf826af163b1d11f3557eb7cc0968302e4b9ba5630
font_02_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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