Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea840a1deb57870…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 18:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7859bd4b813c023f0fdb6e4364a52b6 SHA-1: db40037255e3bc135e2d06b1240a4f00ce1d9414 SHA-256: 7ea840a1deb57870a651ec264c252c7fe108ec8e62f440c0e142ebd35c7c92c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically identifying it as a phishing or trojan threat. The presence of multiple links on disposable or compromised hosting further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lammermoor.net/imagenes/file/84829456434.pdf In PDF document text
    • https://mszukam.pl/dat//file/81671825478.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/busofumogokeminafefawu.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/ruxupamotazelanujav.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210618_032B8E1321DC2CEE.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/pamedovagi.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/zobozodugodipisonusira.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q5vgp6ihl09lc9unsqrrv88sj6/vigiz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f9939d89---niruleputarebowupuroz.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ecae6343b9d---68635511554.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/de044305d2b9340ce4bffe3d2e22c0c3/nenidipidododudusazezu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f025aa8670c---30411885046.pdfIn PDF document text
    • https://campermagazine.tv/public/file/47627788197.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/safejerimorones.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/77150012972.pdfIn PDF document text
    • https://atiksigorta.com/files/31050854713.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b227a43fb6b---17255830683.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/78353235169.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/51jupp5jpobnom2c57o8foiv5s/84042281350.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/24676625445.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/5834286475.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d67684d47c---bamilew.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/zemoponazevoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=newton%27s+second+law+experiment+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_off0000bc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC50 10980 bytes
SHA-256: e52a3fe227b627bcb0b5f377a04bd187eb34ff2098c0c6ac96d08a1d179e9a9d
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16084 bytes
SHA-256: 64b7fa56800eafbda1e22f6c54c66fe98c5ad8c92df9fe3a82a802644b98ffcf