Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a904de46c392a8…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 19:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e057fa2f6c3fa7aba0d4f9e9cf2b8267 SHA-1: 01aae22c92336fd266381436655a32ebef386622 SHA-256: f0a904de46c392a8f023c1b63cc9937de01a9aa4ee5e49a8526a30a2ee69c326
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160905a649e43e---95741573105.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5edbeeea4c654c2418c17191e58f4b78/sevimewewefemokabasixer.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/da2363f321a04171e39274af5b61d18a/39690577103.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91de773a5---xasolipapep.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91b33d5f2---4465484040.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca8267b0e---xuxupuwabupusanipixe.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210510033434711583ccgvmf.pdf
    • http://otczenacts.com/media/files/vetupavirerizejulatoniz.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1544ae0b42---vurafusidusat.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/3791955682.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vkvih7pn0i1tob8478rlqoelir/biziju.pdf
    • http://luatsubienhoa.com/upload/ck/files/10650124878.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160704539a6008---jodevafuzolimijugus.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1f2286187---29845430638.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/pibemebo.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/08efc8e30a574dd177c91bd3d8b26cdb/92743287915.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/cv4b7u77f6oes90v36f9ae836r/dojuzaviterut.pdf
    • https://tecnibat.net/uploads/archivos/nikopowu.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c384901b---57774785074.pdf
    • https://protrialse.eu/files/files/58397578623.pdf
    • http://shuswapladystriders.ca/userfiles/file/xufunulogomesilukaw.pdf
    • https://motelandratecuci.ro/userfiles/file/65024947300.pdf
    • http://huiking.cn/uploads/file/200655107188.pdf
    • http://sage-chem.com/image/files/20210615_211856.pdf
    • https://aduanaldelvalle.com/userfiles/file/76593299729.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fable+1+anniversary
    • 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_off0000f348.bin
678b3046359fbd4eb496f1da93b7a0b9e579dccb567c5fa7a64c1c1070368a79
pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 17876 bytes
font_01_sfnt_off000121e1.bin
93231675c891280aa40927419396693b9bd627947345f5ea88ba5a13ca6d7606
pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 10232 bytes
font_02_sfnt_off0001390a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1390A 16792 bytes