Malicious PDF — malware analysis report

Static analysis result for SHA-256 531a48c6d844d45d…

MALICIOUS

PDF

103.4 KB Created: 2021-09-04 23:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b78aa2562f671033b9deb6053971d46 SHA-1: ac1c4d72d1abe5254a0e4533dc4ecc1bcbac1de5 SHA-256: 531a48c6d844d45d4e4eb6842d7821fc81a6bbeed38f266a87e5402b608ba662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://catamma.ru/uplcv?utm_term=acm+icpc+2017+problems+pdf PDF link annotation
    • https://mccartha-cobb.com/userfiles/files/26252965165.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/tadetuwe.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5bb751435---jimoduregumomome.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/34255098680.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/61190945935.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/mukebimemojuxutewamuligum.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/57237244613.pdfIn PDF document text
    • http://bankerz.in/qpic/files/21350638666.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/nokoxexewowodigejefesakor.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/88285289989.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4bvjsd345r2s5r675j048670r5/nawupoxazola.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/82ad9dcb4490aee0b6dee20c248086f8/30958347520.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/bazifuxumig.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788aad63cc4---16885397236.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/kuzajulasagovoxe.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/24610711151.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/67727435366.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/6027778206.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98d94f15c---81438553027.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/1d3e4a1c5f43f971dacbd035f1eafd80/91767501728.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99f6da5a6---padatinovixosotonexo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nmo0a1i3gjef5sqa766svp3gp6/wivadunoviwuduwakibigir.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210902210913.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/mifukeso.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/21662681090.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5af764efc---27728608312.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lu5gfok73730kbaaftadiaar3i/nusejubik.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_off00012b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14379 19612 bytes
SHA-256: e8dcd3f15e4485d45c027b7eebe5b7954e3a1b0405a74dee9488b0d762e5b277
font_02_sfnt_off000176e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E1 10880 bytes
SHA-256: 94f37d11ae6cdd2ee826810acae249598b8c3797a1b52b3b1623a338d3e6ef88

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