Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0248faae58e66a…

MALICIOUS

PDF

103.7 KB Created: 2021-07-04 22:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10fca34751c4294200848fd2a7075612 SHA-1: ce0db0abc8cc0ad6ac047d368d34e1685f020bcc SHA-256: ac0248faae58e66af40e713b8491398d4830c61b9b3e60a049ce4030b4d8c798
156 Risk Score

Malware Insights

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

The PDF sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c91a0eb0349d7724f01561854494c8b5/44006396852.pdf In PDF document text
    • http://forter.vn/hinhanh/file/38022279159.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab62ea9bad---demapepapezux.pdfIn PDF document text
    • https://digireg.dk/upload/1822931654.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/xupuvetasexigonus.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6nglh5nhl1s0d2h9epq33i4s5/zisituzodufuve.pdfIn PDF document text
    • http://svx.su/ffile/file/zurenadozagisarotenoxixaj.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96903d284---wezuxinusojibufo.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ucctmjear9o58r3d2lhn0t415v/jeginukojorixu.pdfIn PDF document text
    • http://canvangdientu.com/images/file/91315649447.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/gpuu79jj4uf1qfj4qv4c5u04f4/jozawibisewisoko.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878cbd9ad0d---zolalizevetile.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b925d70196b---welusexakepugodewaxa.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/52060378612.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1958d52e9c6bc0144ef65665300c2855/japotudelodemasovomor.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/faxilarojarodafagufupavi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ah02mbob8ve785inhigffeh8rr/bagideja.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/70399180101.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/bajefukitajedotasefet.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6ec0bf44---44599237175.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/gepojuwuzokital.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dfdsj44v8c71dblri2keqtjp37/26913946620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fundamentals+of+signal+processing+for+sound+and+vibration+engineersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 11244 bytes
SHA-256: 4a42171b52426875188551de085a2707c990db914de364961332e47d374d1180
font_01_sfnt_off00014935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14935 17968 bytes
SHA-256: 372844b58c7c59db4d50ae2f1ff6b2b7a927951920b47e988c068cdf9588fb01
font_02_sfnt_off000178ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.