Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc86d023ca34d92…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 06:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fb20f1200e86e90c5fbe0b86325fe37 SHA-1: b71318cdae2024e168f93cbb2cf944c31eb15279 SHA-256: 9fc86d023ca34d929678f5caddd353049f04228a0ca5a6a00a856704f093087b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=d%26d+character+sheet+fillable
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/kisogumerero.pdf
    • https://baigiangtoanhoc.com/upload/files/soxegevaxovusi.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/83834576347.pdf
    • http://casavacanzesanvito.eu/userfiles/files/54383188265.pdf
    • https://growyourmoney.in/userfiles/files/24781832706.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614347ac9688e---28506239713.pdf
    • http://hoteldanang.vn/uploads/images/files/pifukeronupavol.pdf
    • http://vividconcept.in/userfiles/file/towaxikanaj.pdf
    • http://kiko168.com/UploadFile/file/20210923215923177.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614839e2e153f---35919373910.pdf
    • http://wxmx.cn/upload/ckimg/files/202109260206313662.pdf
    • http://pereplanirovkaoblast.ru/pict/file/tojefedizabekujore.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f0af40a2b---mefofowakigulepurab.pdf
    • http://huthamcauquanggiap.com/upload/files/mitazudiwasobufitaberobi.pdf
    • http://najlepsietorty.sk/uploads/fck/file/karivazotovanepewidoxipim.pdf
    • https://samudra99.com/contents/files/47255434528.pdf
    • https://kermanrooz.com/img/files/90775898702.pdf
    • http://okmarin.ru/userfiles/file/ruwos.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/juzisedujiduvagofofosow.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84fd4a456---nakadiwetaf.pdf
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/laberazop.pdf
    • http://iwilldoit.ru/uploads/files/files/kibebixaguji.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/19f413e28ff4d92d17214cb08996b4a4/wazakatural.pdf
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/13374400851.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/lewusetasanetusiwew.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_off0000b1ee.bin
a35de9e7ade20a129797d09785087a84bd4ad83e8fa726b326cc32878b8d68d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 16556 bytes
font_01_sfnt_off0000dc54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 16792 bytes
font_02_sfnt_off0000f46a.bin
f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 9076 bytes