Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c038a82a65ae1c…

MALICIOUS

PDF

125.9 KB Created: 2021-06-27 18:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 220cc4d6a3a732d852335c61558cf8d4 SHA-1: f694f525b87dfdb45dbda6e19bd12ca4316bcdf4 SHA-256: 58c038a82a65ae1c7c985d73a9333791a01631e4a245a48ab01ade85d9d456e6
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to lure users to potentially malicious sites. No scripts were extracted, but the overall pattern is consistent with phishing or malware distribution via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63e262db---nolafulakewemazopufobu.pdf In PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0464f251---60511135503.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76a7948a0f---liwipezojij.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cd14a877---19186735835.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/8823427903.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/af7c20663cce6a300798b4947381950a/fazesatowebijiduselu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/dapezetosivobozunuzud.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pisogexag.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210609_0C3404B5FAD8226E.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f07e975da---77203081445.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075da5b91424---kozamorikojapupaz.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/22054811560.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608350106b9a1---xibaxigiliwig.pdfIn PDF document text
    • https://ivanamihic.com//files/14658037098.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xagupezejunom.pdfIn PDF document text
    • http://szwygs.com/upload/90028120027.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/wezitusux.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/45d384f491b7ed4d7156a3b6344774a4/vimatotizabewifewi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tlo8rv2cj8shfurkvkhpmuuf3q/9964556982.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/7e4d96cbb307c000f694e9e4af8a7b63/98970308441.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210525/file/16219262803827.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/89616429141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=physical+therapist+are+doctorsPDF 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_off00018aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AEE 10624 bytes
SHA-256: 220f824c5723eda5e5c101b76dba45f571178ef5e79a65966efda5063ff352bf
font_01_sfnt_off0001a363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB75 17372 bytes
SHA-256: a2d1c8dd3f2bcb664e055bdfff602dd16d61f1e56c8b950ae90b0f876a8324ab