Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5fee2cab7468df…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 21:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc7aa175e70e6a193431048df0c0f175 SHA-1: b981cd71335fa360f3e3ea4148fc2b32c2fb8572 SHA-256: 7d5fee2cab7468dfeced7b2312607e62ac6cd316dca22e764d836f2e8986558e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve as a landing page for further malicious activity. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting an attempt to obscure the true destination or leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5cc2fb09d96f2e8cb98f65859b1a90dc/nukagukotaw.pdf In PDF document text
    • https://akgoz.zemta.com/uploads/files/wufigavikesogetev.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ff48bcf0---44311773411.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/safosiramefevuzigumu.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/11297326104.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/32931939800.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/tarebupisadagupakago.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/romukifixitupal.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/19801497661.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/wigosupaka.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/xazapiraritaxozipetu.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/7351703379.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/gukedubi.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/telubumosa.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c20ca51bc1230611b659d3b4676a93b8/35299575128.pdfIn PDF document text
    • https://digireg.pl/upload/64215892284.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108281036134349.pdfIn PDF document text
    • https://inncredel.com/uploads/gemediwadu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729fc81dd70---90925201948.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/999e308ec5c47628d938b69d07c06590/gidufulibi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/6h5e2vcu7ks9vd69j7k9504936/femudoxabadujajigalopeb.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608155da9ee15---zakul.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbae42a6---26965921406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=2014+ducati+streetfighter+848+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://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_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 11388 bytes
SHA-256: 97a74d717162a80e2dbabd000dbf71e26fb03df1573a300b230e0d57ef65227d
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 16268 bytes
SHA-256: 289357b5b0b878b99005d4b106760288dcbfe976153133346cb583671e7c1a09

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