Malicious PDF — malware analysis report

Static analysis result for SHA-256 2146a9021ccf8d71…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 11:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3dcb973f6fa36108e93ab563bde66188 SHA-1: f1f650e81143035cf3cbc9f431d1c3d10b838ddf SHA-256: 2146a9021ccf8d71602c410fcdd3bf12d82bb7ed565207e796e686cc55938d7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to use these sites for malicious redirection. No scripts were extracted, but the overall structure points to an attempt to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://anhuicrew.com/upload_fck/file/2021-7-14/20210714024314878275.pdf In PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841aa3eb35b---748236015.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b1d856345ea21ca96539b03e8cec03cc/nuxododekatoni.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/tugoxigimigemanotaxulude.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160db2684677d9---valoxemijexusawokolariga.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/bijujuxexab.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa84e1b18---6523348640.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/xikufetujoseb.pdfIn PDF document text
    • http://nineslash.com/user_file/file/nudovesuliwusaxo.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/69999453220.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9q5lnmcd72slk8ia0schl7jq4l/walosedugatudo.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/40400141217.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vb05bedk4gj3vddepiq5htoj43/weroxavurejabonilezum.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/45030382399.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/lefagu.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/radivozegumofejalakirun.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/bowup.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/e9j5ddhplr9f638iu4pug80v3s/jodiweregadunarukazugaxa.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/8057104300.pdfIn PDF document text
    • http://haai.org/upload/file/doguninixigavogusuzor.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d003a977248---89550144499.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7aff98d10---22339204667.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a8e777e8---19781480169.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jovidifasapajavolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ford+focus+st+2016+manualPDF 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_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 10952 bytes
SHA-256: fbee84952ffbd2d4b8cb728b878063c4f2f844d006d2b976e53ccac5cc28abaf
font_02_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 17168 bytes
SHA-256: c53e23d997eb261edfa1b72b51c0850337c0253db4a54faa53f2c67200c246bf

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