Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94f19a188e96d6a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 01:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ed87fa96ea671fcd78c20be6683a6b5 SHA-1: 74bf0dcb97edf790fb82b42fb91e8b9c1260d466 SHA-256: e94f19a188e96d6ab024ba15588654ce03c95f4d71973913701e38b1118051db
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://capableapp.com/uploads/files/7821200726.pdf In PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/putofoxigatinaxo.pdfIn PDF document text
    • https://adium.ru/userfiles/file/68612357777.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/tepekem.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/vevavikipolebetes.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/14916956096.pdfIn PDF document text
    • http://goldmustang.ru/files/files/muzakesupiseripopidezagax.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b382e0ab84---sawuxoxuleni.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/zaromuvufiferepaxovo.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1b1c3eff2a7727a3f970e3894728cdb6/81400336319.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345b7eda60b---14467610082.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16147b0ec62d5c---1894128147.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-19/20210919210820601242.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/narorunonemajusuze.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/bisoromupisipabasudarili.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/dagebudiva.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/doziju.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/50341990889.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/jijenulokupuj.pdfIn PDF document text
    • https://mcsfood.com/images/file/pikanumubonaz.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/merigu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///25864156190.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/396c12e7997fc52f4702890e2db4e180/gasaso.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/feruvakafejapalizex.pdfIn PDF document text
    • http://www.buildonhope.org/file/26621868315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=when+we+young+adele+lyricsPDF 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_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 18292 bytes
SHA-256: c9ed7f552f82586be8caaf53f0b58b0b011309443ec640f25376eec3f014fc63
font_01_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 10844 bytes
SHA-256: fe2a3b71b9f7297128ac0bcf0da87c69cf026304d1fb7c3b82e45989efbcd87f

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