Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdbfab2fc35d11b…

MALICIOUS

PDF

88.1 KB Created: 2021-06-25 14:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ffdc21c986829a9895f1e1641128dd72 SHA-1: 2a98a794283bea6105c4d0d5741f3cb5f4af7724 SHA-256: 1cdbfab2fc35d11bf79bdbaf0f3f11f054685fcf5b09a1b845870cbad8ceae8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=defensive+communication+in+relationships PDF link annotation
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/be52589eeecd1cecf3007e5e9548972a/68856985435.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c48542cf5a64889e36e355a2739e58ce/sevijegixevizomaxakikotul.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/997a7af40687af8c3420cc3b01850920/58181722618.pdfIn PDF document text
    • http://pinpointfeedtech.com/ckfinder/userfiles/files/13916892663.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/o9kbfuob1fj2nhvs6jepd7gehd/jenategusije.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/fimemewemim.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1fa5ef1e---76071944520.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099d7e3cb800---lulelolanijorejitolex.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kuekntl3kv7dgjoff12s6028h6/11920279853.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/papomudolovukoravipuwapa.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd4e93bdc---jubusipupataburegirujoma.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/48932882735.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016fe78e7d---46118988330.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608886deb9392---foxekulabejotiririfedabix.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/22569920558.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e7b7f754fc6d1d37f3d51bc07f771a78/17219872954.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdf46e5fd7---nexumerafiz.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66f5ebf560---soterafezewoxidizuretil.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_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 10912 bytes
SHA-256: 2521ead0cd8f0817d1166810e502384a5c4f7a9d1213630531f5d080e52b5632
font_02_sfnt_off0001273f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273F 16872 bytes
SHA-256: 7104da43dfdca76005e2e683d2e14d0cee39ad5a3fe66c34d66e6bc10cb01d9b

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