Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50aade8ea8b433f…

MALICIOUS

PDF

91.2 KB Created: 2021-08-08 14:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d135f8b853749d4c66801fe98075fb8e SHA-1: a2a80fdb0cf58dbc69946a64983cb7013646aa60 SHA-256: d50aade8ea8b433f34b79da1237e461afc14fa69da58dd313b942522a8686411
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or are structured as link farms on disposable hosting. The presence of these links suggests an attempt to direct users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=craftsman+6.75+lawn+mower+oil+drain+plug+location PDF link annotation
    • http://tieclangman.com/Images_upload/files/8823083357.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/4193903404.pdfIn PDF document text
    • http://antae.be/app/webroot/uploads/file/73592316451.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2d91d065---6825780373.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fb7c5f64fae56d4675f65d25509ca45a/23264676271.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/dawuwabulemuzozirowevuzu.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/49261992537.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/kajuzebafidimudobafaj.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607479f2eda34---zupaxizenoguxufukuzisat.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3a5c7f5de---66871348462.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18679d702---45334534799.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/puzemadevikelesesobi.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/74518707371.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be389f1b308---zemexivifogewobusofa.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/xolufobawu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773e59e251d---rugunux.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/wasubesadorofigu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac59bc9821---13950141196.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/48558883447.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/1904785481.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a2d6fa480d70ecf1ae05ae89a6c6c6f6/5777413596.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/56413372136.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/41f5bad9b36c8f2184e2e4ec4c048e8d/96362917434.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/jibatodaluxamegupugepi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093064858622---nosobi.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_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 16872 bytes
SHA-256: 837e02dc111c54facb13480269a38e27c636a05ddd2c873a90152a19649c12d2
font_01_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14281 11600 bytes
SHA-256: dc1bc6aaf6c99eb8e9051b960389dbef3a32e56b6b8f75637973422c4a2237d0