Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc335530a9f7e35…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 00:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dbc54ae1812bafe3630222bb75c8119 SHA-1: b640cc93a4af9e79ddde0daf48a8119de433caf1 SHA-256: ddc335530a9f7e35034dc96219618e1bec5a14280136f04da76cfdbdb4098305
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and disposable hosting, likely to obscure the true payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to evade gateway security. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/76bc2f854da39187d5098ae33ca80435/77864066043.pdf In PDF document text
    • http://delve-cr.com/uploads/biselijaganutitaruzunudov.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160753dde093c7---98893910382.pdfIn PDF document text
    • https://fallsplat.se/file/panojanefutexided.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3d73e6fe---ruruzaneba.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/30489663022.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/74506501232.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/43965042730.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/88354736376.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/vokujupakuvogirawuz.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/c02r3qiq9l930rv345qu4hd0i6/80723678225.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/lumej.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ssk4k3aol0hh5jc97ffsfvbeq4/bigarobijosarikikerigepo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb91de7f75---kilujitavulavokalulomanad.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/vusuruvotuve.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/wezudos.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/34810610484.pdfIn PDF document text
    • http://willbramephotography.com/fexovekoxo.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/zafuduxiwoxokikulob.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/57454899194.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/319f814b26ee419c4ea526895d11e6f8/40113451270.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/27980810704.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/zexifexogeloriji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=extract+file+online+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_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 20308 bytes
SHA-256: 071ea5c8bab65a87696405ef71d9ef6796dd9500218a8cc0e651bd917e616ceb
font_01_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 10532 bytes
SHA-256: 809fece628d1ed36dff4f0e400686519148e0ab190fba980f4d2c1c48d128c7c

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