Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccad649799a20c5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 19:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0caab3df050ec871459936531af9d08 SHA-1: d16d58e9cdd23a2d563588c19900950b3f82dc92 SHA-256: 6ccad649799a20c57d9cf44200722d11cf5d5c966d970ebad0340882300df886
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeffa9799---55932322373.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ue0g14aabdqdoaav355gc38dkv/givepabasoto.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/pomuribuk.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/53262777456.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa39d6f66---nowepavegavutuzibiranog.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210904_045853.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04a6653ba---96661722327.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161382b643bbfd---82874441747.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/fawafapapavelifakosajesa.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/27608485244.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/4471335791.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccm41o7e4tffdndh76en4d7tqo/43846042886.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/63854637853.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/soporajelelutusovudetov.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/12947d91f2d1ca0e421212e0cde1adf6/mamidonerifoweroxofesowek.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/18639211661.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109050207301366.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/fefebi.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/wovitilojabofarek.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/pamibivaxojut.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8eb3d71760714b53ecdd3e0493fca527/83188010063.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/87690338067.pdfIn PDF document text
    • https://conrays.ru/f/data/59541652518.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/kumoretuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dbz+androids+17+and+18PDF 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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 10476 bytes
SHA-256: 48b43195e721d9eb113a546ed7419f95ceaed34091059e1dc191650130245d2e
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 17212 bytes
SHA-256: 1509e802f807398f3facc689aa813ce4c0fb1ab68e70a75feb25c7f843a79ba6
font_02_sfnt_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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