Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e5aead41b54581…

MALICIOUS

PDF

68.2 KB Created: 2021-09-05 12:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 058d445099c2accb49075acf8f077bdf SHA-1: cd6d74c90a9a7bf8110c88e56e398a4fad9386f6 SHA-256: 79e5aead41b5458187a605618c2fdecbcd343596b1e512a98c74bc515c06479b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content or phish for credentials. The PDF document itself appears to be malformed or obfuscated, with no readable document body content, but the presence of numerous external URIs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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 https://nomylo.ru/uplcv?utm_term=incoterms+2010+pdf+ti%E1%BA%BFng+vi%E1%BB%87t+download
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e752244b4d---tofulusuvepolepegip.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4424ef1a3b---zogibaliguvew.pdf
    • http://dietaltop.com/userfiles/files/kanuwiwukemobaso.pdf
    • https://espritgt.com/userfiles/file/zufufidunogewejijove.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16073f72082b66---zojasufatowupetev.pdf
    • http://hilimall.ae/uploads/files/nogadavalabetujeximekixoj.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607262a274fe8---26713643866.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f3a94317---xotezopuletove.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e03fae3e3---21797248461.pdf
    • https://liur-krd.ru/userfiles/file/badifajimepebovakejup.pdf
    • http://minhvuongthuphap.com/upload/ck/files/jajugamexagajorun.pdf
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29804569603.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094987c439ae---48657100892.pdf
    • https://gulfb2b.com/userfiles/file/ripevakelararavil.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1ef3e31228e123e16e1bfe724b7aa50e/99337995039.pdf
    • http://stevis.cz/files/file/50989641411.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2c0171356734b86fdb13f459767778c5/rigonibomitine.pdf
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/2236829883.pdf
    • http://chingyi.tw/userfiles/files/magozeletarojir.pdf
    • http://brandnewgoods.net/userfiles/file/96225128025.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c33c338e7---tizuf.pdf
    • https://communeouchamps.fr/userfiles/file/56970168056.pdf
    • https://suativisamsungtaihanoi.net/upload/files/52439416225.pdf
    • https://mfdesign.hu/files/file/mirogupixikulidefa.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c66e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC66E 16792 bytes
font_01_sfnt_off0000de85.bin
db4f8cbe4ba0c58175a1b7e1993087b5befb82a206a9c8ff18ac692f91fe791e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 11744 bytes

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