Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1c3304f054b819…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 14:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c9f157f5603df1b42411d9f8ff6b845 SHA-1: cf6abf70330280ac646cfb3c10983d1f4779d1bb SHA-256: 0e1c3304f054b819efe6fa3f4b5cfd6aefc436d0e51d70fd5db1e3953efd6642
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary purpose appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ltpbetel.ro/userfiles/file/dokim.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e9dd08a3---67657311155.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ca940978b0b228deae01363ca08fe5f1/37252068093.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/xepuzudimoto.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/72765219679.pdfIn PDF document text
    • http://bamor.org/userfiles/file/33325402549.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/tuxajisonixudigotideduj.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabef4a5d3---zomebomawosilebaxel.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/45888759522.pdfIn PDF document text
    • https://zhansq.cn/upload/file/jipoxeropapokizuvigamo.pdfIn PDF document text
    • http://chicopharm.com/upload/files/wakuxolidonomubezu.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/17653770241.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/todozudepekokugoso.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/38345883858.pdfIn PDF document text
    • http://ashioke.com/images/library/File/riwegofafizimugez.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/73955800478.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/98106860388.pdfIn PDF document text
    • http://trevorhannant.com/41196337134.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/fotagivivopuripiriz.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326863a28a5---wemajirigijivopabo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aa53b6f946c3b615f3c8f437def38504/gogag.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/33910731263.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e650da0f5---69753798254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tekken+tag+iso+for+ppssppPDF 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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 17716 bytes
SHA-256: 8ee37ad6621ece40d0c7a360029eeaf758339275e01f635daa3b68b9429ec2af
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 10540 bytes
SHA-256: 2f8d08c6e5f12dd846c60449d187623d3f4ead0bb08f7db5f123abd7096def02
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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