Malicious PDF — malware analysis report

Static analysis result for SHA-256 50312ed9d04792b6…

MALICIOUS

PDF

93.4 KB Created: 2021-09-17 19:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0cadc3dca5b171dd36ab05dcc9add057 SHA-1: 8c393b3fc5dfae4047f2fc6a2abe697d56c4fdde SHA-256: 50312ed9d04792b6c1c9723b896e2eb5f505bb94312b396bb06017422cd4ea6b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://inwebjor.ru/uplcv?utm_term=krisp+for+android+download PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8r8m95rfahi4rr9q71mg7v7oj5/kirozurowusixujurawin.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613df398cad1f---meviviruw.pdfIn PDF document text
    • http://safarang.com/basefile/files/xivovowilamonegurofumija.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/9579182146.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/45456463303.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/pipatolijoruxisewi.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gaxusafaxusisasaz.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a4820b7fb---mokuwozofeximeni.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/kixevisosegasenomiganu.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/53601381048.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/waxajaridabipuzokusug.pdfIn PDF document text
    • https://dm288.rs/slicice/file/42665439602.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/lumejiz.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/85235774527.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/poxizudasapiteke.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/mixizulojoneto.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/vurizigoz.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/walipexojutatex.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/99520002248.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/107603017.pdfIn PDF document text
    • http://esejsc.com/upload/files/55007908090.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/20487671109.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/65339066201.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/74447503953.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/4941633080.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_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 10340 bytes
SHA-256: 35e374b1e398729a35bf8e624b4e71a5b525e1c8beb551e16f562f9aac034e77
font_01_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 18524 bytes
SHA-256: bc22327cc6c417c50d10cb29177718530171c5ce588707ccebd104abef9452be
font_02_sfnt_off00014ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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