Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf0d92b3b3efefc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-02 12:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 527edce224f5a57fbeac89f110a3a6f9 SHA-1: 137f74abf5b8e889c10a9595724dd27550afacd5 SHA-256: cdf0d92b3b3efefc11665ab633db0e9b8cd6e9afa1661d7af301cdb98962b1bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a7e8fc25---xomigeluta.pdf In PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/14060858835.pdfIn PDF document text
    • http://cga82.com/admin/File/75072655720.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/13526076187.pdfIn PDF document text
    • https://electroagro.es/pub/files/fevutibux.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gqokp2vl98bb1glilmd7u1famg/88910039245.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/cc3bee5d92b92b47bac8c6e1233f7fd0/jutiperetabuxu.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/74544371375.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e40c873d---10470699505.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/42967294957.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210624215031.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da86a5baa18---wadidekixopaxorifaru.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/mizidemefatagibuduku.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/01p696cm43h0pim71019a04k4c/bixonemifaneso.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/68565692209.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/sosatirike.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/tekenavevekupavutore.pdfIn PDF document text
    • https://mahae.hu/files/files/97289703888.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1411053272609e5da479b19.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/62329670603.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fa8ab9fc2---27857357568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=arthropods+of+medical+and+veterinary+importance+pdfPDF 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_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 17016 bytes
SHA-256: 681b162755a3d4823275eb5393edc04337dd27441cbe8782f6ebcfbd4834b922
font_01_sfnt_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 11048 bytes
SHA-256: 88f47549d3837b07a77ee2f0f2178226df22cfb7881f230ab5eb228c132f59ea
font_02_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1