Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d25e7fe5e87463d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 03:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 336ab66b9284732152a53dce54a402c1 SHA-1: 653cba92d08cf8da5b286762adfcdd74b565df06 SHA-256: 8d25e7fe5e87463dae948f37b71e331dc857241404fee5e2ee6b596dd33a2ed5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting a phishing or malware distribution scheme. The PDF_RANDOM_URL_LINK heuristic further supports the malicious nature by identifying links to algorithmically generated URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=psalms+for+anxiety PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bd5a09cf---98567254247.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7324a43f6---wunumamani.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/papilubojidumarapisogir.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9d978d3bf4277cacf767254b56df87de/lumisaxe.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/posuwumamotudovotefo.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/dasuwibux.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/83495881380.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/tojotugiluzuwawij.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/jesedenikipitejof.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa322e8aa5---93398919811.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/72179881812.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/442aca11adc04577c40ee754aef6d76a/borejugunagogesawalosa.pdfIn PDF document text
    • https://onecre.com/images/content/files/pebusitojovasewuvitemapem.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/newamule.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/72734959172.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/usfreipek6mnp1tjr68kfsc4rc/vuwudogax.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a89a68262---41770483387.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071521204473499.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/321069837.pdfIn PDF document text
    • https://artbynela.com/uploads/file/wavux.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9a6cc878---10587462850.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/37344323005.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f38ae5176---leraxinajutirax.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/dfff82dd3899a8b9561a2cf30e308ead/renomovujudiwiweniwu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865ebfc2125---jazapamu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c791b26c86---11470913955.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 10592 bytes
SHA-256: 0b39b788398b4e01cab87f72f788c6be7c4990e2fae1acd4d9d625de9570010e
font_02_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 16948 bytes
SHA-256: 701183285308ace3c423f60ea3d048d2187b0552ce5bf23b9a47e2ca2977b2e5

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