Malicious PDF — malware analysis report

Static analysis result for SHA-256 6775b4e51b7d2d83…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 14:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f0269ce332edb8cc36470bd8318ae7c SHA-1: 17ca462e745176fc7cc3d922628b93c0bad24db0 SHA-256: 6775b4e51b7d2d839db81590dc6c76c280ef5e93ce2769d90e87018415ed68b7
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 it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The PDF structure and link farm heuristics further support this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089775ab4338---83120902061.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63f6b12b6---41470074885.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cd2cc7b9771e23a5cf82c0a1a6361bf/xugisorulaxomag.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/pozevivud.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/repulawilanalekenomo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160816fd4cfb89---39947128018.pdfIn PDF document text
    • https://lasanisports.com/files/7978934992.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/buxubabobumosepeber.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c46f37eec69f460720931339c5ef9750/luviro.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/wabodepipolazufufexudelu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cc31e7db6---39787805560.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a643815015---velorapab.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/88965415654.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db8174e8503---95416636903.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/17cff9877706ec4555777300b53ddbdd/34062150185.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fubinifa.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/10357428232.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8150e38b3---toxetatepazajigikuw.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4c728691---58232479172.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/46557646882.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/jasinuvalojakumijosedaf.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/safijezatofe.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac68baa295---bobufega.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/paxinexiwolakanap.pdfIn PDF document text
    • http://canadanur.com/resimler/files/pexulafabatalajodowoxud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=financial+accounting+17th+edition+williams+pdf+free+downloadPDF 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_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 16704 bytes
SHA-256: 994c67f0366d72e622e1aadc1d152824cbc404d76afd33e77c065514c419cebf
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 11332 bytes
SHA-256: fd1b9a56478d1768b008b79dfa3058c524dc519f4bc78d263fcc4ec695c602f9
font_02_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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