Malicious PDF — malware analysis report

Static analysis result for SHA-256 650984fc760050ab…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 12:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eafb3d86ffba7edbf0959531b0e2971c SHA-1: 877fc2a45a7bdae86aae59477e0c28a9d6ab61f6 SHA-256: 650984fc760050abe04dd9b332401ed90640b22ca0f3a552fabb040e3b085f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://casaatlantida.com/userfiles/file///34248152877.pdf In PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/54212539147.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c869e60c8604b0993501d442d0f5907d/20618002376.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/42370619777.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/sobufomogazowugesafu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/34b736363b2b2fcf29cd2685e352d81f/22021892018.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/63961047208.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/pogubezunava.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9a028978---80070445236.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/tugokuluzubamudo.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/xutunofavizodoniruzel.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/zidizobotosafuj.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a552be132---59854115994.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae3690765b---63877151033.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074900dc1da8---86014439287.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/lapugi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/sur72jprjpq3vi6g2l1so60sr2/sowugaropibetuturonuzeso.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4c72ahqjtefn95vtamasri3cl2/wiwadakekipimop.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/20113055625.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/vaxosozolud.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/buwirupowotifavexapif.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/togomesozawobunajew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2008+land+rover+range+rover+hse+owners+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_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 17944 bytes
SHA-256: 836249c6e30e9da702cd740ee959e38f13d388c670449f7ea0d93615e1148d7d
font_01_sfnt_off0001153e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 11108 bytes
SHA-256: 04fb8f509510e5f7b062e9431afdaab601cb61b72bf54acabae8414da32acc35
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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