Malicious PDF — malware analysis report

Static analysis result for SHA-256 455d63a44e98ec2b…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 01:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9ae58bb91c3e63c25c4249907d41f11 SHA-1: 94565ca218046a8c61ed12b3ae72d2e8708a17af SHA-256: 455d63a44e98ec2bef383a5ec15c1f102c43ced43c6d19a352bd6b422bb8fbf9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=perry+mason+the+case+of+the+nine+dolls
    • http://vaness-sens.fr/ckfinder/userfiles/files/degigenaguwun.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/16dc0pqd88dki2hfu39vr8p5i6/63017750205.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d496d5c97---jewewizemadakituxig.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b73a0c64---85982389463.pdf
    • https://ikuseikyokai.jp/ckmedia//files/30166407475.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/48680323e2d9428569669ac9ae94c6e8/gexedegeto.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608357421c88f---6052113495.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4fa86519903550f016ca56fb2bb81dff/7652824231.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a8b53a37---35416800996.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f4ec0875f34d9c84d144bd1ca7642a5c/90807275802.pdf
    • http://brukbet.com/user_images/file/tivubuviroxan.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/fogefudo.pdf
    • http://yejida.com/userfiles/file/xadad.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/ef743e049337bde4fa5ea3c8ae7dea75/gonurunuwetunitaganoto.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b420592d314---sirimobitupe.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9a1050dbb68e2846f37590b47c316b3d/nupetigevetekogaxev.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a90511100b7---52062132821.pdf
    • http://wienbildarchiv.com/upload_files/files/jagozopiniwobe.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/pakufosurepuxugofeb.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079014e363f9---49459096408.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094f9b80bded---puzitusigena.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/beriwafexujelatafesesid.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847f263444---10349614223.pdf
    • http://airelimpio.mx/img/editor/file/3741834287.pdf
    • http://cephedanismani.com/images/pages/file/57056263175.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d973158dc2c---33751384680.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_off0000efa8.bin
aaffe94326d3e408fbcef1d34e347742962cab4608698eea756f50a4c4c50327
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 10856 bytes
font_01_sfnt_off0001088e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16792 bytes
font_02_sfnt_off000120a0.bin
a02607e27372ded593fad5662934cd0dc53756199c2a08f9f55d722c2451fcd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 17564 bytes