Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53d32c03d32d6d2…

MALICIOUS

PDF

75.3 KB Created: 2021-09-28 02:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79b38a2eb31d083e3aed5970f5cabd30 SHA-1: f9e822ed2b72996ac1f28dc4f0c839edfb7f63ec SHA-256: a53d32c03d32d6d2956af21cfb34b562b0c0cb466f5b57414b484f6ea05e6a10
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://sugarfree-gelato.com/upload/file/96054294944.pdf
    • http://acunambalaj.com/adenoto/upload/files/nasefad.pdf
    • https://maxflowfans.com/userfiles/file/199936543.pdf
    • http://alisawedding.com/upload/users/files/dowaxa.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/navaj.pdf
    • https://sentinels.ro/userfiles/file/89227563255.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6d79f4f0e3710cc1faf35b9790cfcaf8/vupapitawogu.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pt9k1ive5s3u1r6b51ijbm97o/samixib.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/remikix.pdf
    • http://m2m2design.com/userfiles/23084292340.pdf
    • http://loadcell.vn/Images_upload/files/24555812711.pdf
    • https://otoform.com/upload/ckfinder/files/ruvibajitagivedetafag.pdf
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/8475968267.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/98cc42d45976334bb8701494f94dadd5/dopiriba.pdf
    • https://groupunsur2.com/contents/files/64181309598.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493175dddb1---wuxolukepawupif.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6aaab8389---75875494910.pdf
    • http://someteme.com/archivos/_20210915215855.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jules+verne+20000+leagues+under+the+sea+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000bba7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA7 16792 bytes
font_01_sfnt_off0000d3be.bin
70ca7a7a53aa3b2fa26a58a1172b8065c34d4d4cb4ba0da8b9b7b6795c31d731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 10964 bytes
font_02_sfnt_off0000ed0a.bin
5580c3f8156bcf4a1ecad366dbd3ee21434864c759e42c2e8f93507035374108		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 19340 bytes

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