Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd56e0e72ed009a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 06:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6ade3d784d16a287ad9c32771243954 SHA-1: 48d8e91e6c7c72762ddbd6ce407e7fe85e9bc87a SHA-256: fbd56e0e72ed009a004081fbf264fbe31e85888a42952bb4b15f2f854944e9f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b2254bc8---lituvumipitarofa.pdf
    • http://articolo17.it/siti/usr/foto/files/76119869674.pdf
    • http://salukool.ee/upload/userfiles/file/28483030496.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d26738b57f1---wibesewitoruvasaxukosizez.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00ed447b2---sudoputunumawetixutux.pdf
    • http://webbuilders.com/files/file/17821689139.pdf
    • https://laznia-radom.pl/userfiles/file/pavariturofokugidenofu.pdf
    • https://n-v-v.dk/userfiles/file/vagorokepokisatus.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/nr0g199a82o07hk12ne4mqu8oc/49192920360.pdf
    • https://harrisitalia.it/uploads/file/15421446420.pdf
    • http://year-c.com/upload_fck/file/2021-6-11/20210611090407980686.pdf
    • http://konberdbio.com/upload/files/kurevirolidawolemeken.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/13b55e477b9173d9549ce84e1cee1225/99948852745.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e433d8093c9---96055289719.pdf
    • http://alimentosldm.com/userfiles/file/rureweli.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc6c29063a---tajowusitavobumu.pdf
    • http://russkiivopros.com/images/FCKeditor/file/xoxajasipubukis.pdf
    • http://szkolka-wiercioch.pl/files/file/noregejofojuzaluned.pdf
    • https://alamansyria.com/userfiles/file/34272312689.pdf
    • http://malbreil.com/userfiles/file/numovubolel.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bpure00347fp7d9d6shjak0u0m/12227104407.pdf
    • http://ash-graphy.com/userfiles/file/sezajekizu.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a85bc5368---nulogikusudewekuposukexos.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e4fadb27f33004d6bf178b88181243d6/35049269256.pdf
    • https://laserbeautymachine.net/d/files/45424255394.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/69766624622.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=etiologia+del+sindrome+nefrotico+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_off0000b3bd.bin
c80a7f54f628f02f90e9fbcd88428915e8dbd37031cb31d6f5bf0a60f6fc50ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BD 10948 bytes
font_01_sfnt_off0000cce4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 16792 bytes
font_02_sfnt_off0000e4f6.bin
80f822c0dae40b40e6bf30a56a64b687350855522f9c50e71a5cbcc21222e80a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 16140 bytes