Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03a4ff6a3f77f3f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 18:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4b404a721ca8314fb583771c3970bab SHA-1: ab1508d5c2aa85a61664f36e80f40a0afd18ee6f SHA-256: b03a4ff6a3f77f3f610d20b26f55cbb72fba63fe54f1eb99095d5e2f460dda7a
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to trick users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://travelone.ae/userfiles/files/babimenelibixoxukabu.pdf In PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/48332546931.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/24707330145.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16203440298182.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/f75b7a8b0264cadea6f72ab9b2d2eb47/90737556762.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/87558242096.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1c25cc92---43232149970.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcaea99de3---porofunedizu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/36705660160.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qt0ikofq4tph3ukroeajcidsn1/51853975721.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ce42122bb19f9a9bfa02f24eee88b78b/rafig.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/vamedifezi.pdfIn PDF document text
    • http://k1a.ru/images/files/file/2476955249.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/nipopigap.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/vupanogigifatoxesu.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/53830943727.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a418a8d164b---85806980332.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca0b7e099---54269967416.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/85195069878.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/22608253634.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/lawidatunovanokakabetetak.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bbd67bc44f50518838ad9266c4f69e13/warulelupijeteresiv.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/160f1b308f453343aaee0165ba9b2398/kulujedisiwedoxaxipos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rosalind+as+you+like+it+character+analysisPDF 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_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 10820 bytes
SHA-256: 71ad08ced8d7f2ad184eedbff5bb3189a7669ca6b50c1837eadf6a46d1d0e10a
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 18016 bytes
SHA-256: a13bcdd53f2ccfbe0a7c7246ae8d4be6a9f04041c4e8e50e57d0f9f27f03b02e