Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01fcafc226507d8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 21:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae1b26fe76444ecc0cb6b88187840e92 SHA-1: d59cb9419385e3228097559185837affa41bd177 SHA-256: f01fcafc226507d876befd5b625c6f58d50fcc1c120c55c4fbfa8b9859f68fea
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to host malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://vialivonica.eu/userfiles/files/gonijulexujudumala.pdf In PDF document text
    • http://knshzj.com/CKEdit/upload/files/bufodez.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/57583788851.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210910_B8CE0353C26A96BA.pdfIn PDF document text
    • http://kahasat.cz/data/file/74118908876.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/54731091788.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d46dbd669c---loparomamimi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b26c59afd0bd41248ba101a3bcd40cc9/fedobidatibuxub.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109111230501959833f1k5x.pdfIn PDF document text
    • http://amandamaitland.com/images/file/52019501148.pdfIn PDF document text
    • https://rinducm1.com/contents/files/zajabof.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f19897210---xewipefisezaselifepezowil.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/4326679991.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210913210300.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/13183141968.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/siwuduxozakare.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/81214047226.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/wupexij.pdfIn PDF document text
    • http://dalaichau.com/files/darutizudorilexavivuvexut.pdfIn PDF document text
    • https://combrooncom.com/contents/files/fofokefopegi.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/zejotem.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gadenexulugito.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/46328138215.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///jigurabowux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=d%26d+3.5+forgotten+realms+pdfPDF 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_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 23244 bytes
SHA-256: aa3a704993745e3bfa31f079e0cb1b483665f50028218a7bf9d462daf82a9485

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