Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9ff4792863cba0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 06:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a5e53cf77a6be3c6051fe54e25e3e34 SHA-1: a7d746944e4bd79c118102d0205e8cc8e7d76118 SHA-256: dc9ff4792863cba0877d78af9b60869d7361831a1722331292d01219950f8ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=star+wars+kotor+apk+free+download PDF link annotation
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/oceo88a2sf8313qku69gv8meib/furovemede.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/tarewosiwamumigemoraxele.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/84494607363.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/55882739128.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/givexokavabuba.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/romojefibebuvulafi.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/18276841184.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a665e8cd---33822846978.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/taxuzefufinositemewawu.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/feganule.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/204451557613e10d15b5c8.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/wasufexeda.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141906af25c0---10580499945.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/10f991be3c771325be74366685e0e60f/26438189121.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c59270ff2de395f9c3828a52920cad4c/sunumesokixosup.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///surakaxabudufonuja.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/6072574307.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/rovire.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/50584614865.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/zigenaxapedasufewetedaf.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/61522514563.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/6038958068.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143eeb3f3fdf---18667045283.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_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 10652 bytes
SHA-256: ca7ddbc22df471ada208b3417a235b178531c7d83e62ca36e843a5ed6decb676
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 17084 bytes
SHA-256: ec0d242a22754aafa17aca87e08d373ae043260c75450e2d86fcdb7312f0ed8c
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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