Malicious PDF — malware analysis report

Static analysis result for SHA-256 663486fc4fc93ae6…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 21:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 4d1c26f9f9669b8bbbac938b3f1afe37 SHA-1: adf63e5ec5638c25d578f1f187e8e82603e0139a SHA-256: 663486fc4fc93ae6afab03b3603683cf6f644907a371005eb326b4ea13d386aa
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=electrolux+washer+manual+unlock+door PDF link annotation
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1764e3d5---96823222322.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/55786827111.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/relevodu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160983e45a90fb---viserazavekezososilepato.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/vqvje545f4rr95thei85qsubqq/12535796046.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/73611471182.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/35468271304.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/guvuxoju.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/58649597979.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b508cdfa29---82842806008.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/jujixigemonaxik.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/tawif.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/07b6cf123bc69a11a30d86f263e68094/68306584234.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/17178689201.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/takeregukovurulotarogaw.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/pubare.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4134b8479---javemarufexogo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79356479364.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0e3334b5906b1a4ab815c5200f3ad102/61514528412.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/55933004201.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/rowem.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/28201300851.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0e8a8e7cb366a04151a9604b41639504/tafegevewax.pdfIn PDF document text
    • 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_off0000b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 14612 bytes
SHA-256: cc674de877169c3f16c930e73977d11f615cc00ba2e76fa213d14093ea9746ed
font_02_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 10904 bytes
SHA-256: dbc4287e8b490238611475bb6288e1806bd4f05659883c3e005ed99c0b7e7927

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