Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdb0e7c4b28723c…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 07:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18a22a86009b2c6b249c58ffc243b3b2 SHA-1: f59256cf7276baeb9ed1922a6466d8a758052ede SHA-256: ccdb0e7c4b28723c544a4258c6b265203f8feb9200e816e64941cde68afb1561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised or disposable domains. Heuristics indicate the PDF is a link farm and points to compromised CMS upload storage, suggesting a phishing or redirection scheme. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=one+side+love+quotes+malayalam PDF link annotation
    • https://0922.sproname.com/files/userfiles/files/87443892927.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/jadajugubex.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/tatedafabunewawawileluxa.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/taxodorukebe.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/85623455486.pdfIn PDF document text
    • http://coumert.com/images/file/59059349313.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/882925244.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615597e76ffbc---deparaxaferewasolamigab.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/65906209525.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2a0bd289d---fuxaxekabojo.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/nopujefunoxelewom.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/23151387520.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/nexovebumorudobi.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/jejofun.pdfIn PDF document text
    • http://land89.com/ckupload/files/43802900273.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/70611937931.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/22405347522.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/liginerazelopekogolememi.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/6406334340.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614522508a5ea---13701198692.pdfIn PDF document text
    • https://tamm.be/_files/file/buzuzebajamovade.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/bulud.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109140734102267.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_off0000b4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A6 18092 bytes
SHA-256: 2b230e124c17b63b46284b34897be14a80bd30e61c75a675f6c3d9391f5d9f0d
font_01_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 10760 bytes
SHA-256: a856f2c2939a38076fa811692622c7ecbbba724ed99f0471885be531d4abd016