Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4faa2ebd4b0f166…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 12:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 759df1685c592a6bf7fd6fce0ab4c452 SHA-1: bb5ac2cfbf80534f95a4751befb651e690854aab SHA-256: c4faa2ebd4b0f1665bbce81db50d9214a80f68fb939d19ae682e8e2c53ba5fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of a URL with 'fake facebook account apk' in the UTM term further supports a phishing or social engineering lure.

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/dcbe73d2a20c74b4998a029a993aff48/jaxoxuriwovazapapa.pdf In PDF document text
    • http://indecomavo.pl/userimg/inc/14605450348.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/12546334782.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/36056856522.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/wovimuvux.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/3374922640.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/bomidaparezavaxin.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/4597525176.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4c82c9b44---5611022845.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/84570517688.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/24979909664.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140433dad8e3---44671615206.pdfIn PDF document text
    • http://12shio5.com/contents/files/sisosejabanazavat.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/ruzivedarijodelikod.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/10089939517.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tegenukodowulasosi.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/42451668994.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/mowopusotenafonop.pdfIn PDF document text
    • http://hflchw.com/upload/file/47897258329.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/kawekavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fake+facebook+account+apkPDF 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_off0000bc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC92 10376 bytes
SHA-256: f89c8064e4669052db8d5f1062e7cca59aa0c24d9f8881902be805640ac69709
font_01_sfnt_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 16956 bytes
SHA-256: 6955ada9d2a5a4e4ad02540f9e6cf7c98e0117fc4f058e99639a72f995825407
font_02_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1