Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0af4a95f761701…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 06:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 347792bc2a1bad7aa235144a8b26a63b SHA-1: eda4966920b566b6e9dc400f17b2ad38d02bddd1 SHA-256: 0a0af4a95f761701f4e94abfe7bbb0d68c80ace16db21f3b8dd59eae0bb3d840
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites that host further PDF documents, suggesting a multi-stage attack or phishing campaign. The presence of numerous links to disposable or compromised hosting reinforces its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e3ae974f0beb28be26df1c2a2999b051/padovegovenuzokari.pdf In PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/luvexadex.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2c2bbaeb02112d0a30a500aceab4b086/musixedotobajojef.pdfIn PDF document text
    • https://area5srl.it/file/wemove.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c94d5346a57538c747f159a60035fa60/70524027667.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb19acc96.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/lenagifaletadobuzuw.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608701e76234d---21206380999.pdfIn PDF document text
    • http://chongros.com/userData/board/file/17247630681.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qsdv0s4fkr3n2h20bu9c1jlaae/61607228637.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/solebuvibebarutu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/vusominajifofagi.pdfIn PDF document text
    • https://bursac.net/userfiles/file/83327720882.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c0f448a59f689682c830ab6e56011f2f/72332912189.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/93820372756.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/zegozefasadakigukal.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805eba82754---miwigate.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0529addc62c1a7a6925c6eebca2bfcfd/suzajisibomevogaxasewa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8af98b4de565a069f1478ac89fe8cdfe/dinozofukamenebusedadul.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/39547360152.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d26567523---18448594806.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/fekogazisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=easy+drawing+body+partsPDF 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_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 10712 bytes
SHA-256: 9f2591fdb8f367dfac1236fef6e033598fec7fd17149f32a37af041bf0d5cb1f
font_02_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 16700 bytes
SHA-256: 4ba89471b0f01f2aa7b7ccf95743d5964fa4e8657a91c8187e118252c4982687

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