Malicious PDF — malware analysis report

Static analysis result for SHA-256 4268cef661f33017…

MALICIOUS

PDF

75.6 KB Created: 2021-06-29 01:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 016e489f1107cf0deefad83178234257 SHA-1: d91eeefb2b5b4a7b6b68746fa8e72f115a985789 SHA-256: 4268cef661f330172941a1ef22babdad0c6b198369eb22cc78d12d2812e2ce6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The presence of these links suggests the document is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7500cd75c---17236674023.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c897ca54bf3---84559719201.pdf
    • http://shqinze.net/admin/upimg/file///23567728712.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/nudogoxufifizudoxakobe.pdf
    • http://lblussana.it/images/file/suwazoveroxupoxafakagak.pdf
    • http://schs1968.com/clients/861610/File/nabadaxumoxunupowejuvifux.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9715ba600---85101113411.pdf
    • http://mintaialuminum.com/d/files/mupobizigipanuv.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1cd87960dbadea566be78a0e29149e24/lurekefebovotafebizom.pdf
    • http://hawks79.com/clients/85064/File/34466718223.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/jeguliwuzakokefuluxali.pdf
    • http://laiyi-art.com/userfiles/file/47399649600.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a4aaa4396---jonibokisuwuzanudaxetud.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9d41d6d4---78894840311.pdf
    • http://www.lnk-creation.fr/upload/file/29523521685.pdf
    • https://bititechnika.com/uploads/file/tamusawibuxila.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac14238211e---dagilutixufe.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084241ed57c5---felunajupixudilo.pdf
    • http://ateliergermain.net/sites/default/files/file/31844657162.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/84f982dfc0cbe9c1d6e117bb4a53d335/73956402279.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d8qm8rand8d84diqn9dgdfn4e6/10240706164.pdf
    • http://urduhadith.org/survey/userfiles/files/saxaje.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160cb85df484a2---simajozemekifusukutesubon.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4840adeaa7e827b48f6a6eec5328ccff/padefabidiradurufisofigag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nude+natural+mom
    • 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_off0000c940.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 16792 bytes
font_01_sfnt_off0000e157.bin
78a05f1d81cd505dc04fb19b1c452f7106db258e6bb04fe77e852e0ad31108f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 10224 bytes
font_02_sfnt_off0000f844.bin
876acfc8a7a766992df53d25edca7c70bb586c1906c428054cf42db525055c49
pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 16044 bytes