Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7191609509fca3…

MALICIOUS

PDF

99.1 KB Created: 2021-06-25 08:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bd1990f1fcc2c53fb93cacf234debf46 SHA-1: c371b96ed5d44cd8a124f47ffb8c2500720b230d SHA-256: ff7191609509fca349126fc3d3a1b46ad4833e955af73220e28200887a8a8e23
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. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to distribute further malicious content. The PDF's structure and embedded URLs are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://dichvugiayphep.net/hinhanh_fckeditor/file/96114287987.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/69ddb7d4f76c6ba45070c32e7038e721/40330404342.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevadogemumeli.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/42575754857.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5027b12b29---lunume.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0340a67b---40611687185.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607289425bc07---danudufotozet.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/dfbd3824a0f227c4088b4b0143064113/pisovatotolovaxase.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/danotigopuleg.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/wedibin.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/57034347223.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/27a6ccda6673f04fee7053b906715046/88552552664.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/sajifofaretezoful.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/84881007005.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/97467926864.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a3a068cf7---galowixalukedobidimave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cq40+service+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FE 5076 bytes
SHA-256: 99f7889911fa2ba3854fa02511cb673f323fb52cdc9b425ca2f33151d3a7ff8e
font_01_sfnt_off00014828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14828 12080 bytes
SHA-256: 9f66b366e63194d99c76489d0e3c921b39e7b4075729ebbae4a5459a908c7df4
font_02_sfnt_off0001706a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1706A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71