Malicious PDF — malware analysis report

Static analysis result for SHA-256 d300b555d9993568…

MALICIOUS

PDF

108.0 KB Created: 2021-06-25 20:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3deaeddf3e0335df66114d86e7b7513c SHA-1: a267bbe7617ec7dfd1ed71dadaecd4219b692373 SHA-256: d300b555d99935681ce95c2cf163233fb5b569bbc96a36c1c6fb175efcda6c87
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the presented links. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/77750v1drbmeu255i9ue0o45m8/69856063178.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d350751619---jamonopesozosoj.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/cb154f3bc705a9437dcc6a996746c2f7/towoketiwakukurud.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7f042d9b1---xafopetesariki.pdf
    • http://dansensvenner.dk/imagesfile///jifukefukotuwo.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85ac4474b---merorijomij.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7665c6711---tavisakukatapim.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53c8b123d---nigupunodukekisir.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/6nlk1027ejnvrotl7o55scgvdi/62603643123.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/085155ec1b68da037cf5c0497fc6a326/lilafo.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/toxisifi.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/cd9fe92b5700af1512e566f2622a1766/kunowalo.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p8538dr1easonqfv6ltv5lf1m7/33136567738.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1mhqkt6m708u3q7ahu2kholgdl/23300553758.pdf
    • https://sbufficio.it/file/kojudomemulabutik.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c820fedebb---60888932853.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/cbfa31abfb72be4aa9313cbf08fed2cc/lotitinegeranulaxo.pdf
    • http://mea-travel.pl/userfiles/file/39784669016.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2956aab826---51341375634.pdf
    • http://matraholding.hu/images/userfiles/files/rajekupufed.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dd1f726694da9353b5b89e1bdecf0e62/rarufeb.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/47839700826.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075373bc0d76---zaputafabola.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4da3896df72e02fa225c47948b7cc557/pomatakav.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e76028ca---188228494.pdf
    • http://smflow.in/admin/uploads/file/65994479655.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=linux+find+duplicate+photos
    • 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_off00013fce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCE 16792 bytes
font_01_sfnt_off000157e0.bin
b8cf898306e2c3843dcec9135bdb79bbf6c609d746268b82e0053c5ca738abe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157E0 18716 bytes
font_02_sfnt_off000189ce.bin
dc732cab68909591774aff5199678939fbc795ea475e15b2e27eb6618ef171f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189CE 10776 bytes

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