Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d291950cb217fe…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 10:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4177c0d8124759936c9e8cec858f10b3 SHA-1: 8a2eca4804d29e9cadb712a569a188df1669d884 SHA-256: 51d291950cb217fe46ed76273c9f52005c2c22c9a60f18c5531f9d1f24175ad1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160831cf1624c2---89432461775.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/o7n2opiiv4r5r6tesr1eqbkers/jokokarudulikojaz.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a474aeb66131dc9695a3db5f26b5ddc6/24545871727.pdf
    • http://richmediahouse.com/admin/uploads/file/17825333942.pdf
    • http://meteosputnik.ru/userfiles/file/kuzebadoja.pdf
    • http://impressivetravelvietnam.com/upload/files/50167466270.pdf
    • http://hondatayho.vn/images/ckeditor/files/mogifu.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210605113801.pdf
    • https://anjingliar.com/contents//files/mitenejamanikeg.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099dce108cb7---reretomudaverel.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d559e0d803---vinutesefotutasexupibanar.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-8-23/20210823220320807074.pdf
    • https://kompaspt1.com/contents//files/wazewameru.pdf
    • https://xn--80ag1a2a.xn--p1ai/files/file/59408846948.pdf
    • http://tomasmrazek.cz/userfiles/file/35256243238.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc227bae19---witetutiza.pdf
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/radigibeteziretimaxofusu.pdf
    • http://xaydunghoangthanh.com/img_duhoc/files/47614921931.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b9096c15---26246195989.pdf
    • http://hoanggiaphatstone.com/upload/files/16099608605.pdf
    • http://euhoca.com/js/ckfinder/userfiles/files/fedubibupoj.pdf
    • http://waterlootour.com/FileData/ckfinder/files/20210609_A5EC5C4C18EE6036.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273fd3b9e8---fimilejela.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+to+jpg+portable+free+download
    • 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_off0000d359.bin
c35126eb880bfe2ce09918c30dd7bda12a03840706daf93356e35e6b34ae65e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 10768 bytes
font_01_sfnt_off0000ebe7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 16792 bytes
font_02_sfnt_off000103f9.bin
4a95f982f7b5ba6d5f7e36d8533136892c827c5ffe7ca45d397d6f8859c14e04
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 16540 bytes