Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fbf7c1bfff2c4a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 11:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bcc1ca0f29a793015f370b5ca66f52a4 SHA-1: e089e46006dc9a95f08855a5204c936592f7baca SHA-256: e8fbf7c1bfff2c4aeb0542f4465cf79b12ecf53f4598654b3a45014c0bc9ff96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL findings are highly indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 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://oniceh.ru/uplcv?utm_term=t+pain+rap+song+mp3+download PDF link annotation
    • http://sdhmladavozice.cz/userfiles/file/fubepunemapa.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2724fdb0---10749386324.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/ralamipixakefujepifofiki.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/84715203394.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/14281178567.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/xavenamigisoteg.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/96440315169.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/bopetonuxowojakibudiwuwop.pdfIn PDF document text
    • https://tekartltd.com/upload/files/3577763455.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2521326e83c4c31b5c55d3bf91cf6d0c/39878809360.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/dotadekejunolagogabuwa.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vizobo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/xasuxifejasitopikafegez.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/wizilovexudinizamuboxu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f59052957c12f3fa4d3d7f8975c100c8/86561678670.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b58ebbc9d---31013221780.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zakekafupojenovik.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7058eef3---66106482707.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/kaxev.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/sikuxugajuximobitiwupex.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/5230323142.pdfIn PDF document text
    • 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_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 10728 bytes
SHA-256: b61a64cf27b52503e9811dbb0b45e5116ad692829fd8cfd335b2e108081cc712
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 18728 bytes
SHA-256: 8a973c7cfef44be3bd01752181293404b55957f93a5db606597fe6130cd1b4d2
font_02_sfnt_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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