Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfd2e57af6d618b…

MALICIOUS

PDF

103.2 KB Created: 2021-09-18 04:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72a9db43e40e2018cc09ce6529b80fa8 SHA-1: 385a5ef2759f4a6d82ab5f86595842623a0f1ade SHA-256: ccfd2e57af6d618b23a2e8d6ae9c1b60d18f624b75928c15e93f599493844a71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://ristovski.mk/public_html/upload/userfiles/file/dubokifubekakila.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/082a5e9f9bc102c41ce68cb7eaa730fe/15175814810.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/kenaxefogirisiserabevi.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/zorabudid.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/vodosufewavafogo.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/tuzalu.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/kivejawovufeb.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/15464827982.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090921334764.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/18e48eaf40cc032b3d4359d799b5b7ac/lezigitisabopugud.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/xogipenelarixojubotu.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/keruxateles.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/76556848787.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/dolerivifawuwefupom.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/87077900890.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614484c0a28eb---98227720947.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/69277086280.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136949da7abe---nejevupuzubokor.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3f815f9de594977e8ff33f76c9edeba7/18841381664.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/vusobadazujowolewoge.pdfIn PDF document text
    • https://majubesar.org/contents/files/ganoropugidifapabuxakubo.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/dagax.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/jezopetaligemuzexuwu.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/bivazel.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/14855957300.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/72273200064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=akame+ga+kill+manga+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_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 18780 bytes
SHA-256: 19a3e224dd8e569d06cb1e4551af69cacc36b853ce88eb333eaf543f5cc01a4f
font_01_sfnt_off0001601a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1601A 10428 bytes
SHA-256: f8bb6262046b54b14d67ae1212e95c44da0e7d066884a8aad4f46b5f3ed9aeda
font_02_sfnt_off0001776b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1776B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1