Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cfbe56b0bfccf9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 13:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47c51ed5f57a2a6e3da4eaad1182e030 SHA-1: f8b8d807ead4580d8d2ec218493e5b48fd3c8355 SHA-256: 50cfbe56b0bfccf9b99eed00f4c25dd9b6c9a53600823f9b2cd9fe15e61193b9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The primary goal appears to be to lure victims to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/nhg5sd9as11rluhvqlf8ao6j50/41610239248.pdf
    • http://soldearenales.com/galeria/files/87219736617.pdf
    • https://nocenzura.space/web/img/podborky/files/jopemarik.pdf
    • http://www.sandipmallick.com/fckimages/file/jurifuruzufe.pdf
    • http://nhactheducthammy.com/upload/files/tipofebinifetemusivuvu.pdf
    • http://rovitek.com/userfiles/file/96862534099.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130853901a5d---14031183332.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/rarotexosifiropogubur.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8eaced5b---78534703057.pdf
    • https://himalayanthailand.com/image/upload/File/vugebejafe.pdf
    • https://takarasushimn.com/userfiles/files/71419433201.pdf
    • http://lerucherdesanges.fr/userfiles/file/nawaviworanikafetegokutes.pdf
    • http://perksys.com/userfiles/file/satoxakuzexivakakak.pdf
    • http://rentbucharest.net/images/userfiles/24297278478.pdf
    • http://paolacaone.eu/userfiles/files/93709533212.pdf
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/31445085876.pdf
    • https://unitjaya.com/contents/files/xalexadabirej.pdf
    • https://suacuasathcm.com/uploads/files/rekaxisajo.pdf
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/45650286579.pdf
    • https://floresdeserrezuela.com/aym_image/files/lurajuv.pdf
    • http://fotografoenricogiampieri.it/userfiles/files/bedutixurasado.pdf
    • http://stepasidemedical.com/images/uploads/file/7069356725.pdf
    • http://thebankcardservice.com/uploads/files/nezukobubataboxekaperug.pdf
    • https://alstar.uz/images/shared/file/wuvapo.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/vebositokafumevetuk.pdf
    • https://www.hippocratio.gr/ckfinder/userfiles/files/53141939275.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kimetsu+no+yaiba+ky%C5%8Ddai+no+kizuna+watch+online+free
    • 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_off0000d3b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 16792 bytes
font_01_sfnt_off0000ebc4.bin
03bbbb51885d7bfab7e0b684aa5e4243363594a1553bcb80eec117444d45742a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 17876 bytes
font_02_sfnt_off00011a5e.bin
056cb298dd0b4c81287a0dc17846c52c6433cee228460bf9e2aed1769a4aa465
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 11464 bytes