Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b08ad00a5adf1b0…

MALICIOUS

PDF

150.9 KB Created: 2021-06-29 03:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4f210b2202624d060bdbc916a6de57bc SHA-1: 36966645095cfdb0fa168b840097a5b56051f7d2 SHA-256: 2b08ad00a5adf1b0c8fd4c2289f9670fec1ef94ba5f409ece830e6085993b7ee
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, preventing a clear understanding of its specific lure, but the overall structure indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

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://aakritidigitals.com/userfiles/files/kolaxa.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609427bce8845---28370897328.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/49476564834.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/78290995428.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/47285687855.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/logogalavanir.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16079b93f18382---sesolaraxegiwunikupugixif.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c81d2e208---30171592514.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/47765277238.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/30aamtvib3n62o2qu6ubgrqrk7/70223873088.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/34018332759.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23bcdfedf---mosowumeniwuga.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/665kl6ccfteb5p6bmkj9meqjl5/31323420346.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea77ef7ee---lemoxodesogijob.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/fatejowo.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/malubavojuso.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ee2b4b58---lupugogiwixilape.pdfIn PDF document text
    • https://chp-travel.ir/data/file/33868850639.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/rifaburiduzimavom.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/88735587374.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/dae9f2f08aebad8eca9a1d1fb8391ca6/femiweluwujepatobepod.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/04f7ad9ee67147923f7de76ccc7b687b/xiterolokuruxegu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0ad8d4ce7---turibivesivusilajusigufav.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608931dfbc948---tadanejuxa.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/foki7r98c582moo40ht6mve6ol/3458734315.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/97518778392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=computer+science+book+for+class+8+cbse+free+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDF6 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_01_sfnt_off0001e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E389 21220 bytes
SHA-256: bc25b40b32f16f2ca30afdabb3f2bf4e0f20f7bf3575d748bc475d509496d33b
font_02_sfnt_off00021ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00023300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23300 11440 bytes
SHA-256: 71d2631efb316f504ae229df637721ff079ec5228800113e77f111f973564095

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