Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1e90d7d9160956…

MALICIOUS

PDF

84.5 KB Created: 2021-06-25 12:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d73bc03191cebd0c866388daf1a40f01 SHA-1: 2011096b5787c7479114c6d5ee1c7b045d1bf297 SHA-256: 3a1e90d7d916095667c2a940502bcc0905d33ae0c8adb1eda3bfb66786266206
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve to obscure the ultimate destination, which is suspected to be a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/i9v3vqper2fmeg0kl92i01feh7/fuxenifanepisekax.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/98550027270.pdf
    • http://barcabianca.eu/upload/file/lawojefurolovuguf.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a238a7624f---parovanasumakadewepopum.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4242a76ce5---suforivutapogexosawidudef.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fa216efdc---25886213809.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/26811498246.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a869df53168---40569805907.pdf
    • http://rld-carbon.ru/file/95969523488.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b625bb6230---42372854881.pdf
    • http://zwickerfoto.hu/_user/file/mopokupon.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78718b65b9---32128034264.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770f03e09a9---80305577752.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf23e2c3cb---jotodojawuvowe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gpsa+engineering+data+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000bc1c.bin
5544fe5ebc4d39c3b2325f2873c3766d5a01e37ddc4ee96e845d0786e0d2233f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBC1C 25588 bytes
font_01_sfnt_off0000e955.bin
2e9a7466ce3f9bd125ead2199016bf5a6997f4a9f29a4b58d6d414ee439f82c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 10896 bytes
font_02_sfnt_off00010244.bin
da3819e162777c12d987f28f58c7a50efdca9e5c5cbb97b6ded038604032d6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 15920 bytes
font_03_sfnt_off00012b0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 16792 bytes

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