Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c4095185167aaf…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 03:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0045e690179deeb77921edc8db0c10e9 SHA-1: a4c5834c69794cd511b254f85d9b384be2a56d8a SHA-256: 00c4095185167aaff31d8e821551b23f1812cf2c9055e036a9c1d15e7aa284de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=swan+lake+trumpet+solo PDF link annotation
    • https://villadorottya.hu/uploads/frontend/files/kigalotuxonuza.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/vatuxozefisipebolu.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/69437406796.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/19433092460.pdfIn PDF document text
    • https://nyig.com/files/file/48192781442.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf2eb9d2e---wujejunivakek.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f0b6eadf---polofimudujixidixuj.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/76535910443.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138670278747---93673753691.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613069019814b---juwulowanulenuted.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/lagoturusomomode.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/japutiremifatebijabum.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fuvojonuwusinubumepofer.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/31223878428.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/durelanatin.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/75092755112.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/29790621406.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/57822514706.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/zimukopofuxuxusuwis.pdfIn PDF document text
    • http://floramarble.com/uploads/rokaxolam.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/27032118267.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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 10676 bytes
SHA-256: ea147b0d61dd2d42684e9019f776df81bae79ea52a6da0fa3050584bf96697a8
font_01_sfnt_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 17520 bytes
SHA-256: 260eac12c6e040cf241f1e3c9707a84692d439fb111b5ab3a036f3c1b20c3f87
font_02_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1