Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e159e4c997f95ad…

MALICIOUS

PDF

85.0 KB Created: 2021-07-23 00:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c7f8b5b822f14d52c4e78812d79ed1bf SHA-1: dd15d9608f707c7e226baebdfde2686dd170e86f SHA-256: 3e159e4c997f95ad608b2776069b43dab5767d25497914eeb8b41e19b909e7da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f5603f3c8---mawowajolot.pdf In PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///77531369464.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/dujisulugagagota.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/68264637654.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf4f8cba2f---faruluju.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092516c265b0---5085012699.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/40983969952.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jubuxojim.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fagegasub.pdfIn PDF document text
    • http://wohntraumgmbh.at/pigumabata.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/c693lbtfs7s7ib1ov9tnsd86q3/lemimevojoxizin.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f48bdf8706e---xirigufumuz.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/2d9734cd6b5b40d7fedd05e7253a1914/94560690413.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15af7bfa4---doxosumixonido.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/dogebetubilitigakixuf.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/jusokuzo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbedb3eaded---gujopuxug.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/tepavegile.pdfIn PDF document text
    • https://andrejc.si/files/file/xubejuwabapof.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/fidomebujizewifoli.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/16395096823.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/atj85n503fblk13mvmfe8bt2cb/88281149271.pdfIn PDF document text
    • http://nineslash.com/user_file/file/85520597887.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/3565843259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cool+japanese+namesPDF 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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 16976 bytes
SHA-256: 65411c92cc1adefa5e92d14641a159cbc8becc895f2dcfa5f54249c8a16bd5c0
font_02_sfnt_off00012e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 10284 bytes
SHA-256: f4af3819bd67af364bb3f883bbe7fe8ed52b6ec97a1df36f91d89f1086ae2a73