Malicious PDF — malware analysis report

Static analysis result for SHA-256 b998e16bf637a7b5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-23 23:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e137ad591d9b0dbdd56e9f769e85337f SHA-1: c9bbd69cd374e443bed88d909002d66344ffa879 SHA-256: b998e16bf637a7b5a3e551ff6046d8d704ce703a02b55b446feb4850041e3005
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files. Several of these URLs are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and contains no readable text, making it difficult to determine the exact lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4045

Heuristics 5

  • 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
  • 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://rotarycochinharbour.org/ci/userfiles/files/paputajoxodekunaluduludix.pdf
    • http://maryalo.com/userData/board/file/betafupalopunovulazede.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/89022480229.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/77433968339.pdf
    • http://hitelesen.com/userfiles/file/21891861376.pdf
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/wesowutimoj.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8975a53e---62983144773.pdf
    • http://321eastern-thailand.com/userfiles/files/72818487829.pdf
    • https://bevasilicones.in/userfiles/file/53836821987.pdf
    • https://riolospettacoli.it/filesUploads/file/xototawaponewitale.pdf
    • https://vinacomvietnam.vn/uploads/news_file/4444009289.pdf
    • http://jinyezi.cn/upload/45546545307.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cd62c1780413e27c03107c8e27f0f69c/buladiribox.pdf
    • https://md-bud.pl/szklo/photos/file/72207144735.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/miwuniguwemowabeduxatikar.pdf
    • http://barudan.hk/UploadFile/file/20210917155612827.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a613a2409---62975504839.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d1a4d754f79205e6f230addcd26b374/femomopumefi.pdf
    • https://balajitutorial.com/admin/userfiles/file/85646119733.pdf
    • https://interativacorretora.com/fotosempresa/files/pugevorolitajajanovubum.pdf
    • http://fotocaroli.it/userfiles/files/74625323003.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a70bdb12b---vebol.pdf
    • https://cailux.lu/userfiles/files/94293473390.pdf
    • https://daquin-ferriere.fr/userfiles/file/fuzozixiwabutuse.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=words+with+7+letters+starting+with+s
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc04.bin
41e5faea10ac7fa4a89909571b876126c0cacc9bb0e5665eaa1e807ad789a406		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 18388 bytes
font_01_sfnt_off00010b4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 16792 bytes
font_02_sfnt_off00012362.bin
5ffed921c13ddbba329aa815ed03613fa66d6b03e0b146d0b4ff0f1e6b736fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 10656 bytes

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