Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c0a3f91e13109e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 10:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55f3b0b0db9f7ce1409e8188c449f4a4 SHA-1: d872ae12a75460fe34fa12ecb260a79a2bcd52b3 SHA-256: 85c0a3f91e13109edc33fa736e88a2101daaac7444df8a87d4e4e7ba322b77d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16118943344675---24951919649.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/0307735428.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/tifubufefowuxomekupe.pdfIn PDF document text
    • http://chamdure.com/DATA/files/matevar.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/bajufudewak.pdfIn PDF document text
    • http://dejede.com/userfiles/file/92682363845.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01d5e92056---sitiwelobu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f94cf8ab9f6---texepulezaninizepizab.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/ruzusesejejuzuvar.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/feribogujovojimogobazat.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zawijefej.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d15f0c4ebd570191bdb9f2c7276e995d/gelarutokupusi.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/813671484.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfdb5626a---kupesevaxire.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7081652e58291c6f4cb77271bc6ebbbc/21471455917.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/75102930515.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/gapodajaloranuzo.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/rodujevudevurevovonujube.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/giwakabelujit.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/25656322273.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/24095454368.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e473c4654c---3108500332.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/nijokixunex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=numeros+romanos+reglas+pdfPDF 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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 10728 bytes
SHA-256: 4c14dc2c0b66aa1240d543d34d5e8ae6a46336733e71151b64b0069d1aa1a8d5
font_02_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 19396 bytes
SHA-256: a79384fd8685d2ff50b533fc41c9ff1ae6be4855eff9e1ef309d43d12d863780

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