Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cef1a55ef91909…

MALICIOUS

PDF

87.2 KB Created: 2021-08-12 07:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05de9ff944db84cc55dece70404df0bc SHA-1: 2639450ff696aff70aad80a22e020281e573eab7 SHA-256: 57cef1a55ef919098c018d8cedd1d258a4152d845339c3eceaadcce26d34ed8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pusancard.com/userData/board/file/wigow.pdf In PDF document text
    • http://prodottoitalia.eu/userfiles/files/kapuvozoxofafal.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e3472604e---lesopawirarilatojanutap.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/dazupevewokiberuradajiti.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/686968308.pdfIn PDF document text
    • http://uhorder.com/upload/files/lexobejolit.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/92219722572.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/muxawu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087edb57fa4d---16042088147.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/31290534468.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/24381984261.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/72624521879.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/kudexeluwojurusokurovel.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/68265965546.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8214ced77---79655772399.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a222b878458---13286259853.pdfIn PDF document text
    • http://synowka.pl/galeria/file/xepodib.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/vugekotimato.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/zinuf.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a45840d2cb4---32106066325.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/raxazilig.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a2287cee36b4e9d969eea3632547274c/46026511177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=accounting+conventions+with+examples+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_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 17348 bytes
SHA-256: 0cfd17ac06a51399a69be1b1e6a99cf16433edb0a260c41a752a456473e62e7a
font_01_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 11304 bytes
SHA-256: 21b37a19c499890c6f0a99f358d60c606cc53323131a2acc594a21e9256bed18
font_02_sfnt_off0001367b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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