Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a506084ed0da9e6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 05:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80572bef68d246f5d88517f1ab3da622 SHA-1: 87d2f890e8234cee9872a392c0190c385e032da2 SHA-256: 0a506084ed0da9e646cad46331bd02aa8850c777979ceb7200a34d1c6a6d08c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of external URI heuristics and link farm detection rules strongly suggests an attempt to lure users to malicious sites.

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 https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394658cc180---wofosipogo.pdf In PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/23931151869.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/27840542745.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/26344237796.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/vumajutodataw.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/sizovagifimaxesudud.pdfIn PDF document text
    • http://kezheng.net/Upload/file/58103008211.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/51014971479.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362c093dd89---6841068192.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f313234566---41148494496.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/80845837286.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/87250235226.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/fejudolemitatuzedu.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/bunatuped.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/55403943026.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/64715664336.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/66033569929.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/5679471122.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/xafavemikezuvujokuzudo.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/53730471345.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/jilesikagovamaj.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/14977538667.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/92477310022.pdfIn PDF document text
    • http://movediary.com/userfiles/file/juzerurojuduvowu.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/nejinatal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=games+similar+to+crossy+roadPDF 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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 17136 bytes
SHA-256: 645b4e08443fa8d875b391b634bb02080bad839e0c046581d1bf2ea66c00eb9b
font_01_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 10580 bytes
SHA-256: ea1084c38da6bf90eb88e4dcf5207556af02f58864853e2bbf7582ecbae06ef3