Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43a181be2aac24f…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 10:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f2d09fbd059ae6947cd6ace4ef6e797 SHA-1: 441b3e232a0313cd88570a252a600aa83b634d66 SHA-256: b43a181be2aac24f445964eb666b81841aa807448f1e919cd46f2cdc0b0f3ce5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicates maliciousness, and the PDF contains numerous embedded URLs. Several of these URLs point to compromised WordPress upload directories or are part of link farms hosted on potentially disposable domains, suggesting a phishing or redirection scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://nationalcoopadvisors.com/userfiles/files/vegute.pdf In PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/kodokazinegegesira.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/ritopiwamudifon.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/15325291913.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/87081844571.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///zafuwaximu.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/lanukuxategujasa.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/46388258614.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/velotanexaso.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/kurol.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/35091899508.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f0417552ca3adc68d43c582c64e7938e/volakasabonulopi.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/39088317453.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/e3533a6703e15877d77287d7f92663e0/82322688260.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/64537772579.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/97998803035.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/45354168114.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/nanavurenuropekit.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/dazazifafekalazax.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/ziguvujade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=passe+compose+verbs+with+etrePDF 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_off0000ad5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5B 14724 bytes
SHA-256: 002098e564eda9b02dc57c40db30c1ee43a4d8b2f4f11aac9a2e583be5bb72d9
font_01_sfnt_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 10780 bytes
SHA-256: 6975986890af6f2ff34cd99f9873a37d10e4057f081120b3d08da8d070b662a9

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