Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a45f03bd72e65cd…

MALICIOUS

PDF

78.5 KB Created: 2021-08-31 08:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b042cb91845c84ce2345a3a39b46f6e SHA-1: 2c768f90d7ccb7b75d0685e8198bd41f9f26ef12 SHA-256: 0a45f03bd72e65cdd5227d238c13f7f3cc67d8613c2a26c50c3ff24d3edf710b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This suggests a campaign to distribute malicious content through a link farm hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kdm7654hflk5jt296btkbg57ou/jakumebamuzarefumurotoz.pdf In PDF document text
    • https://readandenjoy.ae/userfiles/files/6818282681.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c78c308fb4---25072876758.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/7uajd2mb8akh6gecn3gqk08f70/wenuxiboxu.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/76213525954.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce99e995185---tebok.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5624ece7bb7980a8834544e2f9ed6f83/59404215340.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/43e2879dfd61a58e4d23b0e860697971/53744198921.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/xifava.pdfIn PDF document text
    • https://kapefashion.com/files/files/moxopuxuzomarafivag.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8524dff9a---zuripekirapafokifidudelo.pdfIn PDF document text
    • http://sns.hu/_user/file/rodone.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc949e1866d---44248666008.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/lukakerosat.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea769abba---34752570392.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3d3f3fdc0c60d47644003c9d9d91c31e/xavob.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/pdli5ej0fp0vqb9d4prhi5j115/97300560041.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160987b73bb504---sutatesovorizod.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/funozonebopik.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/xurifume.pdfIn PDF document text
    • https://egca.fr/userfiles/file/61774012051.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/jaxomiwowe.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/bidopi.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/sebubisugoza.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d18dfaac---4162809438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=traffic+racer+pc+downloadPDF 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_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 10396 bytes
SHA-256: b8a92bcb7a0a2c9857373d9374df57f1fee0d85a25bdc3553a667ad3a160177d
font_02_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 16896 bytes
SHA-256: 862b428bb230aa6509b85c7de73bee524dc192d48c936324eff1435f989da6db